What size awning

Thank you to everyone who helped on my previous posts...just one more bit of assistance needed and then hopefully we can be on our way in our new van!

We have just bought a compass amazon 524 ( 4berth) We are hoping to go away this weekend in it but need to buy a full awning for it. It is currently in storage and we will be collecting it the day we go away so I cant measure the caravan before that.

Ive searched the web but I cant find my model on any of the sites where you can put in the make and model.

So the question is does anyone know what size awning I would need.

Thanks in advance