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I have a set of 215/45R17 tires mounted on RH C2 wheels for my 94 Accord. They have a 40mm backspacing. Will I need to get spacers this thick or will a 30mm set work on my 71 240Z? I'm asking because there's a set on Ebay that I would possibly bid on.

Just bought this fine 240Z out of Tenn. I've wanted one since I was 11. That was the Z's beginning. A good friend inspected the car for me and called to say "Buy the car immediately!" I'll be flying out from SE Va very soon to retrieve my new toy.