Full Awnings
The 'A-Measurement'
The size of awning needed to fit any particular
caravan depends on the A-Measurement - the distance, in centimetres, from the ground, around the awning rail and back to the ground. This can easily be measured following the above diagram.
Dorema Awning guide
Isabella awning sizes (A Measurement)
G10 - A675, A700, A725,
G12 - A750, A775,
G13 - A800, A825,
G14 - A850, A875,
G16 - A900, A915, A925, A940,
G18 - A950, A962, A975, A989,
G19 - A1000, A1015, A1025,
G20 - A1050, A1075,
G21 - A1100, A1125,
G22 - A1150, A1175,
G23 - A1200, A1225
Not sure what your A measurement is try the isabella awning checker
https://www.isabella.net/uk/a-measurement-search