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The Kluger/Highlander brakes are 328mm, the standard are 297mm. All are 28mm thick.
The gen3 upgrade can use either the 320mm RX330, Supra TT 323mm or the Highlander 328mm rotors depending on the type of bracket you get made. I was previously running the gen3 twin piston calipers with 320mm rotors using semi-track pads and the result was an extremely good braking package, however I put down most of this to the pad I used.
With the Kluger calipers I wasn't able to source the same brand of pads without a fair waiting so I went with some heavy duty street pads which are doing the job just fine but are won't hold up as well as the track pads.
In my opinion, having tried 3 versions of brake pads the Kluger / Highlander brakes are my favourite. They bolt straight on with no modifications, and the pedal feel is almost the same as stock except they don't give up anywhere near as quickly. I found the gen3 brakes to be very touchy and it was at times hard to modulate the proper amount of stopping power.
Not to mention as the gen3 calipers are so old now you'd be looking at a caliper rebuild as well, combined with the custom brackets the gen3 would be a more expensive upgrade in the end (cost me almost twice as much as the Kluger brakes did).