What kind of camber settings are you looking for?
The grey car has 17X11 -15 with 255/40/17s and a good amount of camber ~-3.5ish. With ~9mm per degree of camber, you're looking at ~25-30mm of more poke with 0 camber. Your 9.5 +7s are 43mm further in then his 11 -15...so with your tire choice you can probably go up to a 20 or 25mm spacer and run close to 0 camber and be just right.
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