300/440/550 Fitting Jetsport Pipe on Westcoast Exhaust Manifold

I just picked up a 550 with a Jetsport pipe and Westcoast manifold. It leaks like a sieve at the connection. I have tried making my own gaskets to no avail. I have attached a photo showing the size difference between the pipe and manifold (I made the gasket for the pipe). Is there a way to get these to fit together/does anyone have a westcoast pipe or jetsport manifold they are looking to sell?
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Location
Stockton
/does anyonehave a westcoast pipe or jetsport manifold they are looking to sell

I have a west cost pipe, manifold and head pipe gasket ion if interested
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the inlet on jetsport is larger than westcoast.get a better gasket like the metal reinforced green ones.you may also want to check that the surfaces are perfectly flat.
 
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