I found a broken L-shaped part made of pot metal with a small roller on the end, inside the door. Any one know if this part is available anywhere?
You can start at the beginning to adjust your production month, or use VIN, but if you can identify the part then you can use that to search out part numbers. If you have no luck googling up a new replacement part then ebay perhaps. Door latch & lock parts are in the Bodywork section best I can tell - https://www.realoem.com/bmw/enUS/partgrp?id=5374-USA-03-1989-E24-BMW-635CSi&mg=41
