Lunar Meteorite S Caravan Awning

I have a 12ft Lunar Meteorite S model Caravan.
What size awning do I require as I am confused.
The rail measurements from floor to floor = 713cm which indicates it is for a 10ft caravan not a 12ft.

Therefore would anyone know if I need to go by measurement of rail for awning or length of caravan.

On our website, you will find full intructions on how to measure your caravan for an awning. Providing that you have followed these correctly, it should give you the correct measurement. However, I think the 1992 model of the Lunar Meteorite S has an awning size of about 747cm.