Lug pattern

Looking at some used wheels they are are 18*8.5. 5*112 will they match as far as lug pattern goes I know I have to verify that that the calbers will fit

The bolt pattern for a 3000gt is 5x114.3 so they won't fit. 18s will fit but I suggest a low tire like a 40

Not all 18's will fit. It depends on offset and spoke design.