Details
- Length [mm]
- 47 mm
- Inner Diameter [mm]
- 6 mm
- Valve Type
- 40
- Valve Type
- 41
Compare 1 brand — check fitment and order online
OE part number 55186789 is a Valve Guide compatible with ALFA ROMEO, FIAT and other makes. Available from 1 brands, priced from £13.99. Every cross-reference listed below matches the same OE specification used by the vehicle manufacturer.
Original installation position for OE 55186789. The red ring marks where this part installs on the vehicle.

OEM workshop diagram — sourced from manufacturer parts catalogue.
OE 55186789 is compatible with the following make/model combinations:
| Make | Models |
|---|---|
| ALFA ROMEO | 156 Sportwagon (932), 156 (932), 147 (937), 159 (939) +2 |
| OPEL | ASTRA H (A04), ASTRA H Estate (A04), ASTRA H GTC (A04) |
| FIAT | CROMA (194) |
Products matched to OE number 55186789.
| Attribute | Value |
|---|---|
| Inner Diameter [mm] | 5,50 |
| Outer Diameter [mm] | 11,04 |
| Outer Diameter [mm] | 14,03 |
| Length [mm] | 66 |
| Length [mm] | 58 |
| Length [mm] | 62 |
| Length [mm] | 64 |
| Outer Diameter [mm] | 10,03 |
| Outer Diameter [mm] | 13,1 |
| Inner Diameter [mm] | 9,02 |
OE (Original Equipment) number 55186789 is a manufacturer's reference code for Valve Guide used to identify the exact specification of a part fitted during vehicle production. By cross-referencing this OE number, you can find 1 compatible aftermarket brands that match the same specification — often at a lower price than the original. All parts listed above are verified to match OE 55186789.