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Originally Posted by evan9eleven

At issue here, is that I'm upgrading to the later 108mm versions that have the stub axle permanently welded to the outboard end of the half shaft. So there is no separate stub axle with flange. And it appears that my new axles are 20mm too short.

I'm not sure I see how you could have used a G50 axle, as it wouldn't mate to the 100mm 6xM8 transmission flanges.

There were changes around '76 (by memory, it's all in this thread) to the 100mm CVs and flanges, and a change again to the 108mm with integrated stub axle sometime in 1986.

Exactly, the 3.2 half shaft is a one piece with the stub axle.

Yeah, I have a G50 transmission. Originally I had a 901 and that was about the same width as the G50. A 915, if you have that, might be narrower.

20 mm too short sounds like a lot! Are you sure about that??

Have you looked here: https://forums.pelicanparts.com/porsche-911-technical-forum/596183-cv-axle-cross-reference.html
The length of the late 108mm and the 100mm axles should almost the same.