Any dealer for any RV line can order the aluminum siding used on your trailer. It is not "model specific" and any/all "aluminum sided trailers" use the same metal sheeting. The only difference would be the color of the paint that is applied during manufacture of the siding.
Any RV dealer would be able to take a "quick look at your RV" and tell you what color siding to order....
You can also buy it from Trekwood.com at this link:
https://www.trekwood.com/parts-searc...arch-keywords=
The siding is the last 6 entries on that page and when you click "next" the following page is almost entirely "aluminum siding".
Keep in mind that not only is Trekwood going to be expensive, but their shipping will double or triple the purchase price, so be ready to have "sticker shock" when they quote you a price... The best option is to find any local RV dealer and have them order it for you.