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Others correct me if I'm wrong but most of the parts in the IS 350 are the same for the GS 350 It should fit just my opinion and from what I have seen, I could be wrong though. Also looking at there site most of the part #'s are matching.
the IS brakes will fit the GS for sure but only the front, thats what i tried first on my car when Stoptech send it to me then they redesigned it, but here is a link to one on the guys with the Fsport brakes off an IS , I hope this helps. https://www.clublexus.com/forums/gs-...-w-cv7s-2.html