Exhaust gasket help!!!

[2K3 MSP]

I've had my JIC exhaust for a few months now, and replaced the gasket already. I've only had my Apex DP on since Wednesday (400 miles), and the gasket is now shot again. Can anyone tell me where I can find a performance exhaust gasket that goes in the section right after the cat? My dad used a Mr. Gasket on on his Civic, but I couldn't track anything down for the MSP.