SR20DET Valves

[Boosted240]

I need 2 EXHAUST VALVES for an SR20DET as i managed to Break/Melt 1 in cylinder # 2 during a slight case of detonation. The reason i want 2 is so that both exhaust valves in the cylinder are in equal working condition.
So if any of you Have or know where i can get one.. please let me know.

Any and All help would be appericated.

Thanks,