Need a muffler silencer.

anybody know a good place to buy muffler silencer separate from the mufflers themselves? i just put my friggin tsudo exhaust on yesterday. first time i took it out i blew the damn silencer out. i thought that the screws were tightened but they weren't. couldn't find it on the street. meanwhile i live in the middle of nowhere, and i can't purchase one locally. i'm searching, but if anyone knows a good source, please share the knowledge.

ebay