Here's the problem....the obs flywheel has standard threads. The pressure
Plate bolts are shouldered so they center the clutch assembly on the flywheel. The nbs flywheel has dowel pins that center the pressure plate. It uses metric bolts. To use the obs clutch on a nbs flywheel you have to remove the dowel pins, and the metric bolts arent shouldered...and I believe you have to ream out the holes on the obs pressure plate for the metric bolts to go through
It. So now what keeps everything perfectly centered? some people don't have any problems with it but Iv got too much into my build to gamble on something like that