I bought a complete bolt in pumpkin from Diffsonline and it was a fantastic experience - highly recommended. I had a custom ramped clutch type built for me similar to a few other 128 guys and it is the best mod I did to the car, no exaggeration. The OSG is a great product too, but I'd not hesitate to chat with the guys at Diffsonline.
https://diffsonline.com/bmw-e8x-135-...erentials.html
-Mark