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The XC GS I owned years ago has 15x9.5 Centerlines with a 5in backspace and 265 tryres, no issues with guard rubbing.

Yeah, had trouble with offsets on the rear wheels on my XB sedan, the aftermarket Globes are a deeper dish (made by Castalloy/ROH back in the day) and they stick out and hit the guards, with a 245 tyre. Had a 9" shortened, and ran a 3/4"spacer (I Think ?) just to get the look I wanted. Didnt want to roll the guard lip, as it has the Fairmont stainless trims.

wow that XC looks awesome, love those big girls....thanks for the info guys, might push a head and see what happens, might back off to 8.5 or 9 on the bum to be safe, been speaking to the local mechanic who's going to be replacing the old 3 on a tree with a T5 and he reckons that I wont see much of a track increase doing the XG diff at the same time. I can always get the 10's at a later date when the car and suspension is sorted.

if you contact them they might be able to machine the wheel to what you want,but most rear 8 inch wheels would have a 4 inch backspace,you could go a bit more like 4 1/4 or 4.5 on the rear but then you are limited to the size of the tyre ,probly 245 or 255 with 265 being borderline,too me the front backspace is harder to get right if your using a 8 inch wide mag on a xd xe xf,with 4 inch being the biggest i could get on there with a 14inch rim without hitting suspension ,15 inch can go a tad deeper like 4 and 1//4 because its up a bit higher ,i use 15x7 on my xf with 4 and 1/4 backspace but run a 215 and its real close to the suspension ,i run 15x8 12 slots on the rear with a -19 offset which they stick out a bit far but only use a 235 tyre ,your better off just using the performance ford mag the way it comes and stick to its factory backspace,only other way is to get custom offsets and start from scratch but its gunna cost more and is it all really worth it ????