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I've heard people say you may have interference between the GS brakes and the Z51 wheels or wheel weights. No personal experience.
Members are reporting that Michelin is now making the Alpin winter (not A/S) tire in GS sizes, just becoming available. Lots of rumors that the A/S in GS sizes will happen this Fall.
Tire Rack has some A/S combos that are not exactly stock but are claimed to work well.