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The strut bump stop referenced under OE numbers 0344418 and 90497363 is the front suspension buffer catalogued for the Opel Vectra B range, a mid-size car that remained in high-volume service across Europe long after production ended. This page describes the part as supplied by Bonpora (number 4110033), a China-based auto parts factory producing polyurethane bump stops as original and replacement parts for the independent aftermarket, and explains what buyers should check before ordering.
Also sold under the names jounce bumper, bump stopper, and rubber buffer, the part is a moulded elastomer sleeve that fits over the damper piston rod inside the front strut. During normal driving it hangs clear of the top mount. Under a hard compression event — a pothole, a speed bump, a fully loaded vehicle — it engages progressively and converts what would otherwise be a metal-to-metal impact into controlled resistance.
Elastomer parts age whether the car is driven or parked. Heat, ozone, road salt, and repeated compression cycles harden the material until it cracks and loses its progressive response, after which the damper bottoms out and damage spreads to the top mount and shock absorber. On a platform out of production for two decades the original stops have usually hardened long ago, so the component belongs in every Vectra B front suspension service job. For the wider suspension range, see our auto parts catalogue.
The item described here is a front suspension bump stop for Opel Vectra B applications, referenced under OE numbers 0344418 and 90497363 and Bonpora number 4110033. European catalogues record the same application under the formatted references 03 44 418 and 90 497 363, which describe the identical component. The table below lists the data buyers normally request before asking for a quotation.
| Parameter | Value |
|---|---|
| Product name | Strut Bump Stop |
| OE numbers | 0344418 / 90497363 |
| Bonpora no. | 4110033 |
| Fitment | Opel Vectra B |
| Dimensions | Φ19.2 x Φ50.4 x 53.2 mm |
| Material | Polyurethane |
| Country of origin | China |
| Warranty | 1 year |
| Delivery time | 15–30 days |
| Packaging | Neutral export packaging |
| Custom service | OEM & custom design support |
Φ19.2 mm is the inner bore that slides over the damper rod, Φ50.4 mm is the outer diameter of the elastomer body, and 53.2 mm is the free length. The bore decides whether the part can be assembled at all; the free length decides where in the stroke it starts to work. Major European aftermarket brands list equivalent references for this application at approximately 53 mm height and 50 mm outer diameter, a useful cross-check when comparing quotations. Compare all three values against the part removed from the vehicle before approving any substitution, because a longer stop makes the ride firm while a shorter one lets the suspension knock.
Polyurethane suits this duty cycle well. Compared with conventional rubber it resists tearing and oil exposure better, holds its mechanical properties across a wider temperature range, and can be moulded to a controlled hardness so the compression curve stays progressive rather than abrupt. The material also suits vehicles that stand still for weeks at a time, because parked elastomer is attacked by ozone and goes brittle first at the surface — a common pattern on Vectra B cars still running as daily transport, taxis, and fleet vehicles.
The Vectra B, built by Opel from 1995 under the internal project code J96, was offered as a five-door hatchback (body code 38_), a four-door saloon (body code 36_), and an estate marketed as the Vectra B Caravan (body code 31_), with production running to 2002 and the estate continuing slightly longer. Aftermarket catalogues list OE 0344418 and 90497363 for the hatchback, saloon, and estate across the petrol and diesel engine range, fitted on the front axle, one per side, two per vehicle. Several catalogues also extend the same reference to the Corsa B and Corsa C ranges, so distributors covering multiple Opel lines can often consolidate the part number in one stock position. Catalogue naming overlaps in this category — rubber buffer, suspension strut bumper, and bump stop all describe the same component — so axle position should always be confirmed against the removed part.
Demand behind this reference comes from two buyer groups: wholesalers covering the independent aftermarket in regions where Vectra B vehicles still run in daily service, and fleet or taxi operators who keep older Opel cars on the road and need predictable wear-part supply. Both are served from the same tooling and quality system, which is what makes factory-direct supply attractive in this category.
An original-quality replacement reproduces the reference part where it counts: the same bore and free length, an equivalent material grade and hardness, and a compression curve close to the OE component. It does not carry the vehicle maker brand name and should not be presented as such — it is a replacement part manufactured to the original specification, the practical route once the vehicle maker no longer supplies the reference.
A factory with OEM and custom design capability can produce stops to a customer drawing or sample, including non-standard bore sizes, alternative hardness grades, and application-specific profiles — useful for private-label ranges as well as vehicles with modified ride heights. Stocked references ship in wholesale quantities within 15–30 days in neutral export packaging, ready for relabelling or private-label cartons; new tooling is quoted against the drawing and an agreed annual volume. When comparing suppliers, ask for the polyurethane grade and Shore A hardness, the dimensional inspection report for bore and free length, and evidence of batch-to-batch hardness consistency, since elastomer properties are sensitive to cure conditions. Our auto parts sourcing team can review drawings, samples, and cross-reference lists alongside catalogue items.
A worn bump stop is often discovered during damper replacement, but it can also be diagnosed from the driver seat before the car goes on the lift.
On the catalogued applications the stop sits on the front axle, one per side, two per vehicle, and European catalogues recommend replacing it in pairs. Bump stops are normally replaced together with the related dust caps, since all share the same access procedure and a similar service life, and the work is naturally done while the front dampers are off. Support the suspension before releasing fasteners, torque the components at normal ride height, and compare the old part against the new item to confirm bore, diameter, and free length.
Aftermarket catalogues list the reference for the Opel Vectra B hatchback (38_), saloon (36_), and estate/Caravan (31_) on the front axle, and several catalogues extend it to the Corsa B and Corsa C ranges. Because running changes and regional naming vary, confirm the application with the vehicle identification number or the OE number on the removed part, and ask the factory for a written cross-reference list covering the models you service.
A replacement manufactured to the original specification — matching bore, free length, material grade, and hardness — performs the same function as the OE part. Ask the factory for dimensional inspection data and material details so the comparison is documented rather than assumed.
Minimum order quantities depend on whether the item is a stocked catalogue reference or a custom moulding. Stocked references ship from current stock; private-label or custom profiles are quoted against tooling and an annual volume agreed with the factory. Send the target models and annual quantity to receive terms that match your programme.
Quoted delivery is 15–30 days for stock-referenced items, with neutral export packaging prepared for sea or air freight. Confirm the shipping method and destination port when requesting the quotation so the terms match your planning.
If you are sourcing strut bump stops for Opel Vectra B applications in wholesale quantities, or planning a private-label suspension programme under your own brand, send the OE number, target models, and annual volume. The factory can confirm availability, provide dimensional and material data, and quote on neutral export packaging or private-label terms.
