due to the difficulty of removing the wiring for my pool light, I am going to try to replace the face plate instead. however, there are absolutely no markings that I can find. it looks like there used to be three stickers on the light housing itself, but they are long gone. the only markings are on the glass light cover that says "submerge before lighting".
it measures just over 10.5" on the outside (I see some haywards are 10 7/8" so that may be it), 7.5" inside, and has 8 screws.