By asking that question I assume you have all the necessary poles etc and just need new canvas?
If that IS the case then you would need to contact the makers of the original awning as they (awnings) are all just that little bit different.
It would be a bit like trying to fit a Ford engine into a Renault car. Same basic principle, but different measurements and fittings.
Probably be cheaper to source a used awning from ebay or similar, there are some bargains to be had.