I can provide a little more information regarding these pressure plates. All three have similar configuration and are exactly the same size. Two have the "king hat style" hat throwout bearing sleeve washer. Two have a wide pressure arm and one has the narrow arm ( one with the washer and the other without). The throwout bearing sleeves are of two types, the "king hat" and the "stove" pipe style. The "stove pipe" style has no collar for the bearing and the "king hat" style bearing sleeve has a collar for the bearing. They all seem to be interchangable in function. I have both friction rings, and riveted ring clutch hubs. I need some advice as to the assembly options that I have and would work best. Can you use the riveted clutch plate in lieu of the "free friction ring" I checked the part nos on the pressure plates and they are: 344456 (2) and 345455. I found the 344456 in the Master Parts List but not the 345455. Thanks for any advice.