Google search. Read how to take measurements for each awning, measure yours then look at the chart. Measure size and finish size are different. For mine, 16 ft was a 15 8 for mine which measuring was 15 11.
2012 SunSeeker 3100SS Toad-1962 Futura Average 100 + days camping
I replaced mine with a ShadePro fabric. After 18 months, no mildew, lighter and got the metal wrap guard. Very satisfied. Check their web site. May need to get a bit narrower I think ShadePro goes by roller length.
2014 Sunseeker 3170 DSF
Dorothy, Garrette and Miss Bella.
Retired and having fun.