Maddie, that was the exact issue we agreed to avoid. I ordered special marble from Greece and did not want to cut a piece of it in a half moon to fit a skimmer lid. The PB ordered a skimmer he said would work (long throat). I told him to measure before ordering and cutting the fiberglass shell to install. He did neither, cut the pool, glued it in, and it doesn't fit.Perhaps you'll have to trim the coping back around the skimmer in question. Wouldn't that solve that skimmer issue?