How can I consistently determine correct current part numbers for single replacement items or gropus of related items for my BMW bike?
Without the help of an adequately skilled BMW dealer parts guy with current access to dealer-only web-based and phone-based information systems, you will eventually encounter situations where no consumer-accesible online info source gets the job done. Real-OEM is about as good as it gets, and usually contains what you need. Caveat Emptor!