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Are those the correct bolt pattern? Those wheels are used a lot on bmws and VW's. If they are the right bolt pattern they will fit fine but not flush on a gs.
I've got 18x8 +36mm in the front and 18x9 +36mm in the rear and clear no problem. my tires, however, are 245/40R18 and 275/35R18. The tires on your local BBS's look like they're 50 or 55