Sorry, I had slave, and clutch cylinders on my mind. The reason why people are using aftermarket clutch assemblies with their T56s is because the stock clutch assemblies can only be used on a one piece rear bearing block from '87 and up. Most of us are using older blocks, so we need a special flywheel, and while we are at it, a high perf clutch(Dual Friction Centerforce)to handle high horsepower!