Bill will tell you about the offsets.
They belong on a 944 turbo, but I could be mistaken about this.
I think the 8” will fit in the front but you will want 9” for the rear to go along with them.
I am not sure if the 7”s have the correct offset for a 911.
8 in the front 9 in the rear is as wide as you can go under stock Carrera fenders
afaik.
I have 7 and 9 which is a great combo but Some guys want that extra inch in the front. (No pun intended)
951 8”s wheels are quite desirable if you find the right crowd.
http://www.944racing.de/wheelweights.php
Look here, it seems the offset for the 7”s is the same. For 911 and 951.
So they might fit on the front axle of a 911.
But the offset of the 8”s is quite different.
The set looks very clean, so reselling them shouldn’t be too hard if you choose to.