Trying to find a replacement for my inground pool light

[doubletee]

My pool is an early 90's vinyl wall gunite bottom pool.The lamp that came out is an American Products model R-500BC,500 watt,120v,wet niche type.The best I can tell Pentair Amerilite is what used to be American.I beleive that I need an Amerilite 78454100.My lens does measure 8 3/8".Can anyone tell me for sure?

[muss08]

Any 500w/120v flood light should work. Doesn't have to be the manufacturer's brand.