8' Wide 8' Wide Loft 11' Wide 12' Wide CSA - 12' Wide non-loft double loft triple loft 1137-FB 1137-FK 1137-F4B 1137-CK 1137-FD 1137-FK2        1137-FK3 1137-FL 1137-FL3 1137-IS 1137-F2B2B