Correct, 65mm offset will not fit the rear. At least not without a 20mm spacer.
I recently put Cayman S replicas on my car 18x8 front, 18x10 rear. Front offsets are 50mm, rears are 47mm. The rears fit, but clearance to the strut is tight -- probably 5mm at most. I haven't experienced any rubbing, but I'm running 265/35... I think 275s would rub. If you can find 10" rears with a 43mm offset, you would have enough room for wider tires.
Good luck.
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-- John
'00 Boxster S
'86 911 Carrera Coupe (Sold)
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