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The IS250/350 will fit the GS with out a problem. ISF brakes are made by brembo also but, the gran turismo kits are far cheaper and the same quality if not better. Before you ask how I know the kit will work, Brembo said so
I'd like to know who told you this, since we're currently working to get a GS measured, spec'd, and approved by Italy right now. Actually, it's Lexus that says they'll fit (since the part #'s for the IS and GS350's are the same), but that's not enough for the engineers at Brembo. All you GS drivers, be patient, there will be an official Brembo GT application for the GS soon.
BTW, Circuit - can I get a quote on an IS 250/350 GT kit? Thanks,