HELP... Gasket from Headers/Downpipe

[F20B in Japan]

1998 Honda Accord SiR (JDM)
f20b DOHC VTEC

I took my headers off to weld the small inner pipe to the outside pipe because it rattles past about 2.5k rpm and from taking it off the circle gasket is pretty messed up. Any part numbers, links, names you can throw at me? Thanks in advance!!!

 

[F20B in Japan]

It’s metal and round probably copper

 

[Eclipse99fwb]

Bring the gasket with you to autozone or advance. You should be able to match it based on size. If not any exhaust shop will have gaskets.

 

[F20B in Japan]

Edit: It’s called a donut flange. Thanks for the help from everyone that replied.