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The Opel Vectra A and its coupe derivative, the Calibra, were built on the GM2900 platform between 1988 and 1997, and large numbers of these vehicles still circulate across Europe, South America, the Middle East, and North Africa. As this vehicle population ages, the elastomer components around the front MacPherson struts are among the first suspension parts to deteriorate. Bonpora supplies a replacement front strut bump stop for these applications under Bonpora No. 4110034, matching OE numbers 0344412 and 90375586, molded in polyurethane with dimensions of Φ20.34 × Φ52.64 × 68.5 mm. This page is written for importers, auto parts distributors, and suspension workshops that source Opel and Vauxhall components by OEM number and need a dependable factory channel for suspension buffers.
The bump stop, listed in GM parts books together with the shock absorber dust cover kit, slides onto the piston rod of the front strut and cushions the final stage of suspension travel before metal can strike metal. When the buffer is cracked, torn, or crushed flat, the strut bottoms out on hard impacts, ride quality deteriorates, and the damper seal and internal valve components wear faster. Workshops therefore replace the bump stop together with the strut or dust cover during front axle service. Related suspension components can be found in our shock absorber parts catalog.
Buyers who match parts by size or by OE number can check the parameters of Bonpora No. 4110034 in the table below. The inner hole of about 20 mm slides over the damper piston rod, the body diameter of 52.64 mm carries the compression load, and the height of 68.5 mm corresponds to the original GM buffer fitted on the front axle of the Vectra, Calibra, and related models.
| Item | Specification |
|---|---|
| Product Name | Strut Bump Stop (front axle) |
| OE Numbers | 0344412 / 90375586 |
| Bonpora No. | 4110034 |
| Fitment | Opel Vectra, Calibra, front axle |
| Size | Φ20.34 × Φ52.64 × 68.5 mm |
| Material | Polyurethane |
| Country of Origin | China |
| Warranty | 1 Year |
| Delivery Time | 15–30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM and Custom Design Support |
Reference 90375586 is cataloged for the front axle, one buffer per side on the left and right struts. Aftermarket cross-reference catalogs list this reference and its related numbers for several Opel and Vauxhall model lines built on the same platform family. The main applications for aftermarket demand are summarized below. Always confirm the chassis code or VIN of the customer vehicle before quoting, because Opel used several buffers with similar shapes but different heights across its model range.
The largest application group is the Vectra A, produced from 1988 to 1995 as a saloon and hatchback and sold in the United Kingdom as the Vauxhall Cavalier Mark III. The Calibra coupe, built from 1989 to 1997 on the same platform with MacPherson front struts, carries the same front suspension buffer. Because roughly 240,000 Calibra units were manufactured and the model has become a sought-after classic, restoration workshops and specialist traders now source this buffer in steady volumes. Vectra A saloons also remain in service as budget sedans and taxi vehicles in several export markets, which supports continuous replacement demand for front suspension components.
Aftermarket catalogs extend the same OE family, including 0344412, 0344445, 0344401, 90112571, and 90236990, to the Opel Kadett E built from 1984 to 1991 and the Opel Astra F built from 1991 to 1998, together with their Vauxhall counterparts the Astra Mark II and Mark III and the Belmont. Distributors serving European classic and daily-driver fleets therefore often stock one buffer that covers several nameplates. Confirm the exact height and seat diameter against the old part or the vehicle catalog before shipping, since neighboring references in this family differ in size.
Bonpora molds this buffer in micro-cellular polyurethane rather than conventional rubber. The material structure contains millions of sealed micro-cells, so the part compresses progressively under load and recovers its shape instead of taking a permanent set. For wholesale buyers, polyurethane offers three practical benefits. First, resistance to ozone, heat, and aging is higher than that of typical rubber compounds, which matters on vehicles that remain parked outdoors for long periods. Second, density is stable from batch to batch, so the compression curve remains consistent and the vehicle keeps its designed ride behavior. Third, polyurethane keeps a smooth molded surface that resists splitting during installation and storage. Our complete range of molded buffers, including many Opel, VW, and Asian references, is available in the polyurethane bump stops category.
Polyurethane also performs well across temperature extremes. In hot export markets the material stays stable under high underbody temperatures, while in northern climates it remains flexible at low temperatures where some rubber buffers harden and crack. This wide operating window is one reason polyurethane buffers have become a common choice for aftermarket suspension programs in Europe, South America, and the Middle East.
Every production batch passes dimensional inspection with calipers and height gauges, hardness checks on the molded body, and compression tests on sample pieces before packing. Sampling follows AQL practice, and inspection records can be shared with customers on request. Buyers who prefer independent verification are welcome to appoint a third-party inspection company, and our team will support the process with samples and factory access. This approach keeps rejection rates low for distributors who resell the buffers under their own brands.
Most professional buyers complete the purchase in four steps: match the OE reference, confirm the drawing, request a quotation, and book production.
Send the OE reference 90375586 or 0344412, or the Bonpora number 4110034, to our sales team, ideally together with the chassis code and the required quantity. Opel printed this reference in several formats, such as 90 37 5586 and 344412, so quote any variant you find in the parts book. We confirm the drawing dimensions, quote on FOB or CIF terms, and provide samples for inspection when required. Drawing copies in PDF format and sample photos are available on request before ordering. Buyers who prefer to verify fitment first can cross-check the reference against GM and Opel parts catalogs, where the buffer is listed together with the front strut dust cover kit. Mixed orders that combine this buffer with other bump stops, dust covers, and suspension components are welcome, and shipments can be consolidated to reduce freight cost per piece.
Beyond catalogue items, Bonpora provides OEM and custom design support for polyurethane buffers. If your market requires a different hardness, an adjusted geometry, a reinforced mounting seat, or private brand packaging, we can develop the part from a sample or a drawing. The standard procedure covers mold design, sample confirmation, a dimensional report, and batch production after approval. This service is used by regional suspension brands in Europe, South America, and the Middle East that package buffers under their own labels and need stable mold capacity.
Each bump stop is packed in a poly bag and boxed in neutral export packaging, so the goods can be resold under your own brand without conflict. Standard production time is 15 to 30 days depending on order quantity, and the warranty period is one year under normal service conditions. Cartons are labeled with item numbers and quantities for convenient warehouse handling, and palletized loading is available for container orders. Minimum quantities for mixed container orders are flexible, and the sales team can suggest a balanced assortment of sizes and OE references based on recent demand from similar markets. For urgent replenishment, stock references can usually leave the factory earlier than full production runs, which helps distributors stabilize inventory during peak service seasons.
It is the front strut bump stop for the Opel Vectra A built from 1988 to 1995 and the Opel Calibra built from 1989 to 1997, sold in the United Kingdom as the Vauxhall Cavalier Mark III and the Vauxhall Calibra. Aftermarket catalogs extend the same reference family, including 0344412 and 90236990, to the Opel Kadett E and Astra F and their Vauxhall counterparts. One buffer is fitted per side on the front axle.
The buffer measures Φ20.34 × Φ52.64 × 68.5 mm. The 20.34 mm inner hole slides over the damper piston rod, the 52.64 mm body carries the compression load, and the 68.5 mm height matches the original GM part. The material is polyurethane, and each piece is molded with a smooth, closed surface.
Yes. Trial orders and sample requests are accepted so that buyers can check fitment and quality before committing to container quantities. Send the OE number, the destination port, and the estimated annual volume to receive a quotation and sample terms.
Standard delivery time is 15 to 30 days after order confirmation, and the warranty is one year under normal use. Neutral export packaging is included as standard, and OEM packaging can be arranged for private label customers.
To request a quotation for Opel bump stop 90375586 or any other suspension buffer, send the OE number, quantity, and destination port through our contact information page. The Bonpora sales team will reply with pricing, packing details, and a production schedule.
