Navigating the world of classic BMW parts can be tricky, especially when it comes to understanding the nuances between US and Euro specifications. If you’re a proud owner of a 1989 BMW 635csi and facing the common issue of replacing a damaged turn signal lens, you’ve likely encountered the question of compatibility between US and Euro spec parts. Many owners find themselves in a similar situation, wondering if those sleek Euro lenses will fit their US-spec models, particularly the ’89 variant which has its own set of specific considerations. Let’s dive into the details to clarify the differences and guide you towards the right solution for your E24.
It’s a common misconception that all BMW 635csi models of a certain year share identical parts across different markets. However, when it comes to turn signals, there are distinct variations, particularly between US and European versions. For the 1989 635csi, things get even more specific. Owners discovering that standard replacement lenses don’t quite fit are not alone. The ’88 and ’89 models introduced a slimmer turn signal lens compared to the earlier “elephant ear” US versions, creating a unique middle ground before you even consider the Euro spec.
Comparison of BMW E24 turn signal lens types, highlighting the slimmer design of later US models compared to earlier “elephant ear” versions and the even slimmer Euro spec lenses.
The key point to understand is that there aren’t just two types of lenses (US vs Euro), but actually three when considering the 1989 635csi. These are:
- The Original US “Elephant Ear” Version: Found on earlier US models, these are the widest and most protruding lenses.
- The 88-89 US “World Bumper” Version: A slimmer design introduced for the later US models, a middle ground in terms of size. This is the specific type for your 1989 635csi.
- The Euro Version: The slimmest of the three, designed for European market regulations and aesthetics.
The 1989 US spec 635csi requires this middle “88-89 world bumper” version. While Euro lenses are indeed slimmer than the original US “elephant ear” style, they are also slimmer than the lenses specifically designed for your 1989 model. Therefore, a direct swap with Euro lenses is not a perfect fit without modifications.
However, for those seeking the sleeker look of the Euro lenses, it is possible to fit them to a US 635csi, including the 1989 model. This does require some modifications, as mentioned in online communities by experienced BMW owners. One approach involves modifying the Euro lens itself to better fit the US housing. This can be achieved by carefully sanding down the back edge of the lens to reduce its thickness and profile. One owner shared their method of using a belt sander to achieve this, taking care to taper the edge for a more factory-like appearance.
Another method, focusing on modifying the housing rather than the lens, involves addressing the internal reflector and lower bulb socket within the US turn signal housing. By removing the inner DOT reflector and the lower socket (which is attached to it), you create space to accommodate the slimmer Euro lens. To maintain reflectivity and light output, the inside of the housing should then be made reflective again, using paint or reflective tape.
It’s worth noting that modifying lenses or housings requires a degree of DIY skill and careful execution. If you’re considering this route, proceed with caution and research thoroughly. For those preferring a direct fit solution, the challenge lies in sourcing the correct “88-89 world bumper” US spec lenses. Checking parts databases like RealOEM using your VIN can help identify the exact part numbers needed for your vehicle and market specification. This can be invaluable in your search for the correct replacement lens, whether you are sourcing new old stock or aftermarket parts.
In conclusion, while Euro spec turn signal lenses are not a direct fit for a 1989 US-spec BMW 635csi without modifications, they can be adapted. Understanding the three distinct types of lenses and the specific requirements of the 1989 model is crucial for finding the right solution. Whether you opt for modifying Euro lenses, adapting your US housings, or diligently searching for the correct US spec replacement, knowing the differences empowers you to make an informed decision for your beloved BMW.
