a question about my conversion.

i was wondering if anyone could tell me how thick the pressure plate on the 2wd sierra cosworth cluch is from the flywheel to the clutch fingers?
The reson i ask is ive fitted a 4.0 rover v8 in a saff and im useing a T5 gearbox and intend to use a hydrolic release bearing but it seems the v8 cluch plate is thinner so they dont meet up, so i need to know how thick a spacer i need to make.

thanks for the help!