10.5 +12 and 11 +18 stick out the same according to the offset calculator. The 10.5 has more inside clearance but thats not relevant since the Z has massive clearance anyways
Get whichever one is more concave, if there's a difference
fronts i'd go for 9.5 +15 but i'm not sure if thats trouble free for a spring/shock combo
pretty much the standard sizing for aftermarket wheels is 9.5 +22 and 10.5 +12 with 265 and 305 tires
dig through the multitude of wheel threads to find a setup you like and copy it
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