I've have probably the same set up you plan to do, except mine came from a 944 turbo cup. The Cup was a special edition, with even , although slightly, larger everything (i.e. front disc width is 3.2 cm!!), brake wise that is. I think, the Alu arms are probably the same width as the ' normal' 944 turbo.
I used the type 2 axles, which are just the extra length you need for the wider track of the 944 arms and used the bus CV joints for the 944 arm-(out)side, since they are 10 cm at the flange and bug are 9 cm at the axle flange.... Fits beautifully and the bug CV joints slide easily over the bus axle (of course!).
Good luck,
Walter
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