I need some help on what size of light gaskets for my 30 year old pool lights that still work. I realize that these lights are most likely not made anymore; however I don't want to buy new lights if these just need cleaning. The glass lens are dirty inside and I want to clean them and replace the gaskets. I will shut off electrical power to the pool for this project. The larger one has a glass lens about 7 inches in diameter which is surrounded by a metal face plate that was made by Purex. The smaller light is about 3.5 inches in diameter surrounded by a metal face plate that doesn't have a name on it; see photos. Also please recommend where to buy online for fast delivery. Thank you!