Its a SB 3850 street puller and I already had an 1 3/8" input shaft. So all I had to do was grind off the clutch fork (which is normal for a dual disk) and put in a starter spacer. So really I didn't do anything out of the ordinary. Now you do know that the early clutches had an extra spacer behind the flywheel but the later ones it was part of the flywheel so you do have to watch out for that.