It should be stamped on the wheel in plain sight.
I'd check with TireRack on tire size. 10x18s have 265/35 ZR 18s as approved size. I didn't check TSBs for any changes.
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Mike
04 Boxster S - Basalt/Savanna, 6sp, Carrera lites, hardtop
70 914-6 - Black over tan, original/stock
PCA since 1970
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