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Spacers up to 5mm would not be expected to be a problem.
But most tuners would just work out what wheel widths and wheel offsets they want and then get wheels.
Well, wheel widths of 9.5/11 at wheel offsets of 52/74 will put 265/305 tires out flush. The set of 265/305 tires at 18/19 diameters would be about 1/2" shorter than OEM while a 265/305 tire set at 19/20 diameters would be about 1/2" taller than OEM.
Or wheel widths of 9/10.5 at wheel offsets of 50/65 will put the OEM tires out flush. A spacer couldn't do that without longer lug studs
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My experience with spacers has not been good and I don't think I'll try it again. I ended up having to replace some studs, which were chewed up when the wheel got lose.