[Bill Verburg]

David 2 issues you failed to mention
1^st the outer edge of the 944 8 will sit ~12.7mm further inboard than the outer edge of the 911 8, this looks odd to most people, in fact there is a faction that buys spacers to move the 911 8 further outboard

2^nd the inboard edge of the 944 8 sits ~125mm from the hub face, my 9.5" rim sits ~140mm from the face. I needed to move the oil lines and grind trailing arm bolts. I believe you when you say it works, but someplace between 125 and 140mm inboard from the hub face is where interference arises, of course it will also depend on the tires used.