Hey guys, new to replacing pool light fixtures. I replaced my main Pool light bulb (converted to LED) with no issue but the spa light fixture was so corroded there was no saving it. My pool was build in 1994 and I'm guessing these Pac Fab fixtures are original.

I could not find an exact replacement for the spa fixture so I got the Pentiar SpaBrite and plan to swap out the bulb with an LED before installing. It looks like it will fit and the screw will line up with the existing housing etc. I just wanted to make sure I'm not missing something before I go through the extreme hassle of pulling through the new cord and installing this new fixture. I've attched some pics for reference.

Any advice appreciated!