I have a 91 z28 and I just ordered these wheels and was told by the sales rep on the phone I would want 1.5" wheel spacers up front and 2" in the rear. I looked through posts on here but I'm terrible at figuring wheel offsets out and figured I'd Double check with the experts. I attached a picture of a car I found with the same wheels to give a better idea of what I'm shooting for. Thanks guys!

 

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Dunno.
I would think nothing bigger than a 1" spacer for front and rear.
I have 18x10.5 +58 front and rear and use 2" spacers all around.

Personally I would try the front and rears with no spacer and see how it fit before spending any money on spacers.

 

The guy who owns that car is on here Zach/90\irocZ

 

Both might fit without anything but something between a .5 and1" spacer would make them sit out and fill the wheel well better.

Probably opt for longer wheel studs and .5" hubcentric slip on spacers. Try them when they show up and see what u think before ordering a spacer

 

Just remember that many aftermarket wheels don't fit over the hub snout on our cars. It must clear it in order to seat properly.