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For a late offset car the rears fit no problem. I can't remember if the fronts fit with stock diameter springs, might rub on lower perch or spring. With coilovers they fit fine though. No spacers needed. I run them with stock sizes for the Carrera; 225/40 and 285/30. They are great looking wheels, I think one of the few 18's that don't look out of place.
I have 18" Sport Classic IIs on my 951. The issue I had was clearance over the hub cap on the front. So, I added a 5 mm spacer that resolved that problem.
You need a spacer to clear, the problem then becomes lugnut engagement, we ended up putting longer studs in up front to ensure the wheels stay on for track use.