if you can afford those wheels, you can afford for your fenders to be rolled and slightly pulled... I'd say go
18*8.5 +30 front (same)
18*9.5 +30 rear
if you want to run these w/o rolling, you may need to go slightly higher offset, or run more nega camb. To tuck the fronts you'll probably be running around -3 deg anyway... and rears, I suspect you'll need a similar amount.
Have fun!
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