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For reference I run a 18x9.5 +45 with 285/30/18 tires and will ever so slightly rub with a lot of steering input and suspension travel. Your wheels would be 0.5" wider however with a narrower tire so it's going to be close, very close call without any fender mods. What's your ride height?
Hey that’s my old car!!! The montego blue one. I was running 17x8 +25 15mm spacer and 17.10.5 +45 20mm spacer in the back had perfect fitment. Actually still have the wheels and will be going on my next car.
Fairly optimal offset; still, based on my experience with completely stock front fenders you will have to run at least -1.5 degrees camber to fit a 255 on +45 offset and avoid the tire catching the unrolled lip when going up drives at an angle.
-1.5 front camber isn't bad at all for the street, just don't take the chance of running stock 0 camber and catching the fender lip. It will do much more visible damage than if you had just carefully rolled the lip in the first place (which I would recommend for the fronts).