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BrandOPTIMAL
MPNA-3605G
OE refs61
SKU0129-A-3605G
GTIN / EAN4031185079044

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Details

SpecificationValue
BrandOPTIMAL
MPNa-3605g
Fitting PositionFront Axle
Thread SizeM14x1.5
Piston Rod Length [mm]30 mm
Piston Rod Diameter [mm]25 mm
Article number of recommended accessoriesF8-7132
Article number of recommended accessoriesF8-7131
Housing diameter in clamping area [mm]55 mm

OE/OEM numbers (61)

Where this part fits

Original-fit position for OE 1T0413031BH. The red ring marks where this part installs on the vehicle.

Gas shock absorber — A3 A3/S3/Sportback/Limousine/Quattro (Typ 8P) Facelift (2005–2007) — suspension Shock absorbers for vehicles with sports suspension F >> 8P-4-005 000*
A3 A3/S3/Sportback/Limousine/Quattro (Typ 8P) Facelift (2005–2007) · suspension Shock absorbers for vehicles with sports suspension F >> 8P-4-005 000*Position 8

About this product

OPTIMAL shock absorber (A-3605G) restores factory damping characteristics by controlling spring oscillation on both compression and rebound strokes, recovering steering precision and reducing body roll. Damping configuration — Fitting Position: Front Axle, Shock Absorber Type: Aluminium, Shock Absorber Design: Aluminium, Shock Absorber System: Aluminium — is tuned to the original suspension geometry so spring rates and ride height are unaffected, preserving the manufacturer's comfort and handling balance. Mounting dimensions, piston diameter, and stroke length replicate the OEM unit on AUDI, SEAT, SKODA, VW applications, allowing a straight-swap installation without drilling or bracket modification. Supersedes manufacturer part numbers: 110776.0, 126 623 0021, 126 623 0022, 126 623 0025 and 157 more. OPTIMAL dampers are gas-pressure charged, zero-leakage tested on a servo-hydraulic rig, and carry a 2-year unlimited-mileage warranty against manufacturing defects. Shock absorbers gradually lose damping force over time and should be inspected at 50,000 miles and replaced by 80,000–100,000 miles — even if they are not visibly leaking, internal valve wear reduces their effectiveness. Warning signs include excessive body roll in corners, nose-dive under braking, rear-end squat during acceleration, uneven tyre wear, and a bouncy or floaty ride — a simple bounce test (push down on each corner and release) can reveal weak dampers. Shock absorber replacement is an intermediate DIY task that requires spring compressors (for strut-type assemblies), a torque wrench, and penetrating oil for corroded fasteners — allow 2–3 hours per axle. When selecting shock absorbers, match the damper type (twin-tube, monotube, or gas-pressurised) to the original specification — upgrading to a different type can alter ride height and handling characteristics. Always replace shock absorbers in pairs (both sides of the same axle) to maintain balanced handling, and have the wheel alignment checked afterwards — worn dampers often allow geometry to drift out of specification. Every part is dispatched from our UK warehouse with a 30-day money-back guarantee and free hassle-free returns.

About OPTIMAL

OPTIMAL, founded in Germany, is a well-regarded aftermarket brand specialising in steering, suspension, and wheel bearing components. OPTIMAL produces ball joints, tie rod ends, control arm bushings, wheel bearings, and stabiliser links for European, Asian, and American vehicle applications. Manufactured to stringent quality standards with comprehensive testing protocols, OPTIMAL parts deliver OE-matching fit and performance. Known for excellent value and wide vehicle coverage, OPTIMAL is a popular choice among professional workshops across Europe.

Suitable cars

Equivalent products (94)

Show all 94 OE numbers
AIC52566
AL-KO301693
AL-KO303873
AL-KO307153
AL-KO3169G
AL-KO3715G
BILSTEIN22131614
BILSTEINVNE-D932
BILSTEINVNE-E001
BOGE36-C95-A
BOGE36-C96-A
BOGE36-C97-A
BOGE36-D17-A
BOGE36-D92-A
BOGE36-D94-A
BOGE36-E62-A
BOGE36-E91-A
BOGE36-F22-A
BOGE36-F42-A
BOGE36-K78-A
BOGE36-K79-A
BOGE36-K80-A
BOGE36-K81-A
DIEDERICHS9970175
FEBEST1707G-009F
FEBEST2307G-009F
FEBEST2307G-016F
FEBEST26110-001F
HERTH+BUSS JAKOPARTSJ4300812
KYB325700£110.99
KYB335808£61.99
MAPCO20814
METZGER AUTOTEILE2340125
MEYLE126 623 0021
MEYLE126 623 0022
MEYLE126 623 0025
MONROE16498
MONROE742000SP
MONROE742242SP
MONROE742245SP
MONROE742247SP
MONROE742248SP
MONROE742251SP
MONROE742252SP
MONROE742264SP
MONROEE7026
MONROEE7030
MONROEE7031
MONROEE7053
MONROEE7055
MONROEE7057
MONROEE7066
MONROEG8006
MONROEG8373
MONROEG8390
NAPANSA1020
QUINTON HAZELL178945
QUINTON HAZELL178991
RECORD FRANCE334501
RED-LINE39AU009
SACHS310 714
SACHS310 716
SACHS311 343
SACHS313 249
SACHS313 362
SACHSE1021G
TRISCAN8705 29101
TRWJGM634T
VAICOV10-4254
VAICOV10-4955
VAICOV10-6871
VITAL SUSPENSIONS110776.0
VITAL SUSPENSIONS210776

Shock Absorber OPTIMAL A-3605Gcompatible car models

Car modelsAUDI: A3 (8P1), A3 Convertible (8P7), A3 Sportback (8PA); SEAT: ALTEA (5P1), ALTEA XL (5P5, 5P8), LEON (1P1), TOLEDO III (5P2); SKODA: OCTAVIA II (1Z3), OCTAVIA II Combi (1Z5), SUPERB II (3T4), SUPERB II Estate (3T5), YETI (5L); VW: BEETLE (5C1, 5C2), BEETLE Convertible (5C7, 5C8), CADDY ALLTRACK IV Box Body/MPV (SAA), CADDY ALLTRACK IV MPV (SAB), CADDY III Box Body/MPV (2KA, 2KH, 2CA, 2CH), CADDY III MPV (2KB, 2KJ, 2CB, 2CJ), CADDY IV Box Body/MPV (SAA, SAH), CADDY IV MPV (SAB, SAJ), EOS (1F7, 1F8), GOLF PLUS V (5M1, 521) (+8 more)
Engines1.2 TSI; 1.2 TFSI; 1.6; 1.4 TSI; 1.0 TSI; 1.4 16V; 1.2 TSi; 1.4
Year of manufacture2003-2020
Manufacturer article number (MPN)A-3605G
OE part numbers1T0 413 031 AS, 1T0 413 031 AT, 1T0 413 031 BA, 1T0 413 031 BB, 1T0 413 031 BC, 1T0 413 031 BH, 1T0 413 031 BP, 1T0 413 031 BQ, 1T0 413 031 BR, 1T0 413 031 BS, 1T0 413 031 BT, 1T0 413 031 CA, 1T0 413 031 CB, 1T0 413 031 CE, 1T0 413 031 CL, 1T0 413 031 CM, 1T0 413 031 CN, 1T0 413 031 CS, 1T0 413 031 DA, 1T0 413 031 DC (+41 more)
Compatibility check

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Description and what's included

OPTIMAL a-3605g . Article number of recommended accessories: F8-7131. Article number of recommended accessories: F8-7132. Fitting Position: VA. Housing diameter in clamping area [mm]: 55 mm. Piston Rod Diameter [mm]: 25 mm. Piston Rod Length [mm]: 30 mm. Shock Absorber Design: 2. Shock Absorber Mounting Type: 3

What's included:
  • 1x Shock Absorber
Shipping, returns, warranty

Free UK delivery on orders over £99.00. Express and standard shipping available.

  • Standard delivery: 2-5 business days
  • Express delivery: 1-2 business days
  • Free returns within 14 days
  • All parts backed by manufacturer warranty

Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.

Frequently Asked Questions

Is this Shock Absorber compatible with my car?

This Shock Absorber fits AUDI, SEAT, SKODA, VW vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.

What specifications does this OPTIMAL Shock Absorber have?

This OPTIMAL Shock Absorber has the following specifications: Fitting Position: VA; Shock Absorber Type: 2; Shock Absorber Design: 2; Shock Absorber System: 2; Shock Absorber Mounting Type: 8; Shock Absorber Mounting Type: 3. Check the full specifications table above for complete details.

What OE part numbers does this Shock Absorber replace?

This Shock Absorber replaces OE part numbers: 1T0 413 031 AS, 1T0 413 031 AT, 1T0 413 031 BA, 1T0 413 031 BB, 1T0 413 031 BC, 1T0 413 031 BH, 1T0 413 031 BP, 1T0 413 031 BQ and 53 more. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.

How much does a Shock Absorber cost?

This OPTIMAL Shock Absorber is available for £73.99. Shock Absorber prices vary depending on brand, specifications, and vehicle compatibility. OPTIMAL parts offer a balance of quality and value, backed by our 14-day money-back guarantee.

How do I know when to replace my Shock Absorber?

Look for excessive bouncing over bumps, nose-diving during braking, uneven tyre wear, fluid leaks on the shock body, or poor handling. Shocks should be inspected every 50,000 miles.

What tools do I need to replace a Shock Absorber?

Tools needed: floor jack, axle stands, 18-21mm socket for wheel bolts, spring compressor (if top mount must be removed), 17-19mm open-end spanner for shock piston nut, torque wrench. Difficulty: Moderate DIY. Safety warning: Coil springs store enormous energy -- only use purpose-built automotive spring compressors rated for the load. A spring released unexpectedly can cause fatal injury. Never improvise with non-rated tools.

Can I use this part as a replacement for OE 1T0 413 031 AS?

Yes, this OPTIMAL Shock Absorber is a direct replacement for OE part number 1T0 413 031 AS. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.

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