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303 is a really good UV protectant. Not anything like that Ar... on the market. If you live in extreme weather conditions and park your truck outside, your vinyl will be challenged going between night and day temperatures. From what I understand 303 was engineered by NASA scientist (may be just a rumor but it is a proven protectant for many years. Test it on other vinyl parts of your truck. Google 303 vinyl protectant. I bought mine on eBay.
I'm happy.
It was about $250 more than the "X". The X2 install instructions matched the parts. Judging by your comment it was a smart $250. I could find any negative articles about the X, just that they upgraded and that was good enough for me. Thanks.