Topic: Muffler Question - 550F

[Stev-o]

I recently obtained and installed a stock muffler on the stock 4 into 1 header on my '76 550F Super Sport.
There is slight leakage at the joint where the muffler slips over the header, even with the clamp tightened down.
What common material can I use to seal these two pipes?
I don't know if the stock gasket [part # 12 on link below] is available [doubtful] and really don't want to order it if it is, would rather use a locally purchased product.
What did you do?

http://www.hondaparts-direct.com/fiche_section_detail.asp?section=123146&category=MOTORCYCLES&make=HONDA&year=1976&fveh=2943


Thanks.