I have an 85 K100RS that the throttle went out on me. After taking it apart it was clear that the throttle tube and cam disc were both worn down and not meshing any more. I ordered new parts from BMW and the cam disc is not the same style. It seems to be the style from a newer model bike. The parts guy told me that's the same part number for all the years and makes with that type of assembly. It seems I would then have to also order a new cover in order to make this part work. Does anybody have any knowledge about this, or if it's possible to get the right part to replace it somewhere else ? I was going to add pictures of the two different styles, but the options below offer to attach a document and NO pictures.

Thanks