I picked up a 3rd gen cap for my 2018. Fits pretty good. For those that have done this, what did you do to the rear window to make it fit? Just trim the window frame where it hits tailgate?
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It’s an aluminum frame around the window.The caps have a specific window with a cover that fits over the tailgate. The bottom portion is made out of fiberglass and attaches to the lower part of the cap window.
You might consider contacting the cap manufacturer and just purchasing that part. I know on my ARE, every piece but the shell could be purchased as a replacement.