I had my own custom adapters made, but I suspect that they're similar dimention wise to the modern motorsports adapters. I ground down the end of the shaft on the wheel side until there was about an 1/8" left before the grove for the ring. This gave the necessary clearance to get the shafts in. As memory serves, there is no way to affect the length of the shaft through assembly of the inner joint.
Nigel
'73 240ZT
Post Edited (Oct 18, 3:32pm)

Nigel
'73 240ZT
Post Edited (Oct 18, 3:32pm)