it all depends on what kind of subframe and diff that car uses, i saw a picture of a early e34 520 once and it looked a lot like a e28s rear suspension, and if it is that opens up a few doors, like e30s and e28s which interchange between one another by swapping the rear cover and popping out and swapping the drive flanges (easyly knocked out with a block of wood) the e30/e28 diffs mount to the subframe with 4 bolts on the top of the diff plus one on the rear cover and have a 4 bolt flange for the driveshaft. i can't say for sure as all e34s imported to the us had the later suspension