Kennedy Engineering makes a conversion flywheel, clutch disc, and pressure plate (all in 200mm) for a T4 to 915. They can make pretty much any conversion possible.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG