Where can I get an exhaust Gasket?

[Enoch]

Hi Folks, Just in to making my exhaust. I have the DOHC engine, I am using the standard manifold and have cut down the 2 in to 1 pipe. I need the gasket that goes between the two but can't find one. I have tried ebay and various other sources but drawn a blank. Anyone got any ideas? Would I get away with jointing compound?
Thanks in advance,
Enoch
www.deepfolly.co.uk