[boygenius]

I think the 915 drive flanges have use four bolts for attachment and two dowel pins for alignment. I think I read somewhere that you have to drill out two of the CV holes to accept the dowel pins. I think 944 cv joints measure 100mm accross and some porsche 915 trannsmissions use 108mm drive flanges. Not quite sure what year they changed to the bigger CVs. Hope this helps.