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Embarassing. I didn't buy the wrong one. They shipped the wrong one. I have an old hayward SP 573 housing. I bought an SPX540Z2 gasket, and they shipped me an SP-580-Z2 gasket. Same diameter, and the lens fits right in it, but it's about 1/8" thicker. Thanks for the help :)

I'm having some trouble too. A new gasket seems to be a lot thicker than an old squished one, and the metal clamp isn't think enough to fit over the housing and the lens fixture unless you use some force to squish them together. I'm thinking i'll use some ratcheting straps and a couple of...