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I noticed that my old gm MLS header gaskets were the same size as the ones that came with my 2" kooks headers. Are your head exhaust ports that big? You might want to measure some up and see if you actually need one that big. Just my .02
My 2" kooks came with 1 7/8 gaskets. I called cometic and they made me a set for $20. Not the best quality but ok. In all honesty you could just use a little bead of copper rtv and be good.