If you really want to play it safe, you can run: 225/40/18 and 255/40/18.
But that's no fun.
A still fairly safe option would be: 235/40/18 and the same 255/40/18's. If your bs is correct, these sizes will fit the majority of 1st gen's without issues.
*265/40/18 isn't offered by every manufacturer, so that's why I didn't suggest those.
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