I have an 18-year-old pool light that I need to replace the gasket for. The series number is 600019,600020.  I think the light bulb gasket model number is 79208900 or 79206700.  Since the light is like 18 years old I am unable to buy for that model number. Does anybody know a replacement model number for that series? Thank you for any and all assistance!  The gasket looks like it's 8 1/2 inches the front face of the light is 9 inches. It was an American products pool light which I believe is taken over by Pentair.  Thank you again.