Anyone know a source for generic exhaust gaskets?

I need some to go between the engine and headers, and then between the headers and the silencer can..

What materials are generally used?

(its a ZX9R if it makes any odds )

hi
usautomotive.co.uk

Ebay?
Just check the internal dimensions though. I got some that were ever so slightly too small. Other than that I just walked into a general motorbike shop and he had a pile of them.