Finally got my S2 RST engine rebuilt, had the car running and everything was fine until the head gasket went after about 30 miles

. Got the gasket as part of a CVH gasket kit for an RST, although i'm now not sure that it was an RST kit

. The car was running standard boost at 8 psi.
So can anyone recommend a cheap but good headgasket as i don't intend to trun the boost up above the 8psi as i am going to sell the car
cheers