Need light lens gasket for American Products, Series 7885XX, 7845XX, 7895XX; 500 watts, 120V, R-40

[wysocki]

I just changed the light bulb in my old pool light and have a problem finding a proper 8.5" gasket. All of the ones I see and have ordered have a ridge near the inside edge of the ring. My light can has a ridge near the inside edge too, and it's impossible to get a good seal with the two ridges riding on top of each other. I don't have the original anymore, but I remember it had the ridge near the outside edge to interlock with the canister.
Any ideas on where I can find such a gasket?

 

[ajw22]

Pentair acquired American Products, and the light became the Pentair Amerlite.

Maybe @1poolman1 has worked on them.