Pool Light Gasket part

I replaced my gasket last year and it’s still leaking but not 100% sure it was the correct one…How can I find the part number…The only numbers I can see are on the clamp ring and says 61-4600

I was told this one should work but not sure if its the wrong part of my housing is bad. It does have minor pitting around the ring end but nothing major

I want to buy new LEDS but need to make sure they stay dry