Open 2.65 diff assembly in good working order, out of a 1990 or 91 850i with manual transmission. The rear cover was swapped to an E32/E34 piece, and the case drilled and tapped for a matching front bracket. I ran it for several years in an E34 before selling that car with another diff.

I'd like to see $500 for it. Will ship anywhere on your dime. If you just want the gears, I am willing to pull them at no charge to save on shipping.