Any Bstone race tire distributor. Should be $275ish a set.
You want the GP-Mono R03Z YCX front and R04Z YCY rear (not the GP3 as I said above, that was wrong). Run them at 30 or 31 psi hot.
I get 2 race weekends out of a front and 3 maybe 4 from a rear at ~5sec behind lap record pace. More like 1 front per weekend if you're fighting for the win. Slow down a couple more seconds and a 3+ weekend old front feels fine.
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