i wouldn,t do it they are pretty flimsy and don't usually fit well. most use only bolted on lexan windows. you would have to fab everything to mount roll-up windows. and they wouldn.t last to long on a car that is driven often. the hinge and latch only bolt to a thin layer of fiberglass. and they will sag alot with the weight weight of real windows. besides the weight of a aftermarket door shell with no crash bars in it . is not that far off a f/glass door . it's the rest of the stuff that adds up . i.e. glass and window regs. ect. . hope that helps.
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