Leaky light fixture

#1
Bought house with a pool. Just starting to get stuff around for opening. I noticed the light on my agp is leaking a bit. As you can see from the pic the gasket is trash. My Internet searches have turned up nothing in the form of replacement gaskets. My question is am I stuck buying this same model light or is there something else I can get? Different light? Different gasket? Not really wanting to top off pool until this lighting issue is resolved.

Thanks
Dave