twin cam seven s4 clutch release bearing options

flat face on left, roung nose on right, carriers in both (on the bottom of photo). 
broken piece on flat face is half of the platen that was on the clutch pressure plate (this it the "inner end" you dont normally see )
this platen was broken out to allow use of the round nose bearing, which doesnt need one. 
The difference in height of the two packages is ~ 0.1inch when you include that platen, so adjust your slave cylinder pushrod!