InlandRV sells new clips, but the clips are sized to fit the steel-framed Lexan windows they offer which, I believe, are at least a quarter-inch thick. I'm not aware of anyone selling an original sized clip.
My Overlander had a broken, steel-framed acrylic window complete with oversized clips when I got it. To match the look of the other windows, I replaced it with a frameless Lexan window, and shimmed the clips with carefully cut pieces of the old window to make up for the difference in thickness.
BTW, I found mineral spirits (paint thinner) good at removing dried duct tape while not attacking the clearcote.