The easy way to find out is to Google the awning and have a look at some photos. I have provided a link which maybe will answer your question. Just scroll through the photos below the main awning picture.
My 2018 Rally Air Pro 330 has two 'sliding' (pull together/apart) curtains on every window, and I believe regardless of awning size they all were the same style.
There is no excess width in my curtains so they are likely matched to the awning size and not universal.
If its the Rally Air Pro design you are enquiring about
I think the earlier Rally Air Pro models had curtains attached and were either roll up or down. Then the next model released the 390 had 3 sections/windows across the front. So this one would possibly need 5 sets of curtains.
I believe the latest versions of the Rally Pro have 2 front sections/windows across the front. So you require 4 sets of curtains (1 for each side panel and 2 for the front panels).
I'm not quite sure of the year(s) Kampa now Dometic changed the designs. I hope this helps
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