My 9" GE is actually hung from the original motor mount attached using plate steel to the rear motor face. There is actually no transmission "adapter" but the shaft coupler from the original forklift drive system was bolted/welded to the clutch-transmission coupler (now clutchless
). A couple of the motor output face bolts were connected to a couple of the transmission holes with steel strips, but they aren't the primary strength points (the motor kind of just hovers in the transmission mouth). Like Adam said, it seems like you could make some pretty simple connections using the original engine mounts. In my case I would just hang it upside down from the foot, but I don't know how it would work in a VW....
Nice vette project Adam!
-Luke