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I did same on my 2013. The OEM melted and bulbs kept popping. I bought an aftermarket LED version with foam gasket. The OEM design is awful.Well, I replaced my entire 3rd brake light assembly with an LED version on my 011 EL ($34 from da Zon) a while back & it came with a new gasket, but I'm not sure if it is available separately or not....
But if it is, then any of the reputable places should have them, like da Rock, Tasca, FordPartsGiant etc....