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Wow that sucks, though honestly I would buy mine from a site like americanmuscle.com and not ebay
I have ebay ones (not the ones OP linked, mine are from IPEX motoring), and have to say the stick on decals on AM are much worse a deal.
I paid about 40 bucks I think, and got very well built and sealed units from ebay.
Overall it was the same plastics that OEM uses, and they used enough silicon/sealant IMO because I haven't gotten any moisture since I installed them about a month(ish) ago.