4 spd. Question

ive got an 833 4 spd.. My question is: are there different lengths of the front bearing retainer. I know there are different diameters, but is the lengths of the snout, that the throw out bearing rides on, different. I’m having problems with the throwout bearing on a 3 finger clutch. One of the fingers of the clutch slips off and goes behind the bearing when I shove it down with it running.