If you don't have any luck you could try to fab in a Audi 5000TQ differential. I ordered one for just that purpose. They are REAL inexpensive, very strong and allow you to lock or unlock the rear with a push of a button. I keep the board posted on the conversion. Looking for a lsd thats not a 3.07. at least a 3.64. I thought I'd ask you e12'ers since your diffs fit the e9's. TIA