oright i have a s2, and have just bought a headset from my local ,motorfactor(EK,s) and the Headgasket i got with it is made by Fia, i have just read in a post somewhere that you should only use genuine Ford gaskets or payen, is this true or will i be able to use the one i originally got. Also are the rs turbo head bolts stretch bolts. cheers.