For a 298mm disc/rotor you can try a Yamaha R1 rotor, at least according to this post...
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Its a waste of time fitting HH rated pads etc. What i've done is use a Yamaha R1 4XV 298mm front disc(has exactly the same pcd mounting holes-just need drilling out to 10mm) and will bolt straight on! and then i have a Honda VTR1000 (97-00) righthand 4 pot front calliper which i've machined and made up a mounting adaptor to fit it. So my GPZ500 now has a 298mm Yamaha R1 front disc(standard GPZ disc is 280mm diameter), and a 4 pot Honda VTR1000 gold calliper and its awesome!!!! Initial bite is superb, but overall braking power is as good as you'll ever need.
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http://www.visordown.com/reviews/mot...tml#review2775
I haven't tried this yet, but the PCD is the same between the 2 rotors according to spec sheets. Not too crazy about having to machine the caliper, but for the price of a used rotor it might be worth exploring.