I put 18x7.5 35mm offset Konigs w/ 235/40/18's. You may have the more common 42mm or 8.5" width (?) that's contributing to the clearance issue. If you look at the PT's hub, there's not much of a lip there to run a spacer without losing important hub support... that is to say your rims will only be supported by the five studs without the aid of the hub.
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