Hi, I need some help there.. its a simple question but ohh well i spend the past 5 day trying to figure this out, as stupid as it can be i cant decide myself :/ I need a longer throw-out bearing for my clutch fork. Summit list 3 input shaft diameter for the gen 1 350 sbc for a 80 camaro one is for a 1.125 input shaft and the other is for a 1.375" and 1.378" input shaft diameter(measured the smooth outer colar to 1.375" on my trans). Now what is the correct one? for a 4 speed borg warner? Also what lenght should i use? they range from 1.288 to 1.3/4, i have about 1" 1/8 now, didnt measure accuratly. Right now am looking at this one: http://www.summitracing.com/parts/HAY-70-104/ But am totally unsure about the input shaft diameter and lenght. Also, when i check on jegs for the same parts number they list a different input shaft diameter.. this leave me speechless.