There are several ways to do this. I had Lanner, at vdubengineering do it. He is set-up to do it easier than I am. He modified the hubs to accept VW bearings. The CB dropped spindles had to be modified to accept Lanner's caliper brackets also. Have pix of everything on and off car. (they are posted on here just search)
The rear is alot easier as the torsion bars, spring plates, and trailing arms bolt up fairly easy.(getting the 944 pivot bushings out of the arm's is fun
) To use the end caps on torsion bars you must cut the 944 caps down to the outer profile of a VW cap, that's the only hard part. Lanner has some spacers that alow the use of VW e-brake cable set-up. Yes the '87 and later are the widest arm's. Also, T and NA 944's '87 up use same arms, just different rotors and calipers.
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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