Suzuki 2 Strokes

I have some chambers of unknown origin that I got with a T500 engine years ago. These look to be a style that slip onto the stock head pipes. My question is would these use a stock type muffler joint seal or something of a more universal product?

The slip ons i have on my 550 just get high temp silicone sealer on the joints,, but let it go off before running the bike.