Measured fabric length is irrelevant. Look on the roller tube for the sticker that has the awning model # and product # - that will dictate the correct replacement fabric. For example a current Dometic 8500 would be labeled 848NW12.400B ... 848 is the series, NW is the fabric colour (in this case green), 12 is the length of the awning, .400B is polar white hardware. The matching fabric for this example would be B3108049NW.412 BUT since your particular awning is likely on the discontinued list your best bet is to call Dometic with your awning information and ask for the current replacement.