You should investigate how "Just in time" inventory works for the RV INDUSTRY (not just Forest River).
https://www.thebalancesmb.com/just-i...agement-393301
The factory (regardless of manufacturer) orders just what they need for the current year and model they are making at the time. There are no warehouses of old model spare parts from any manufacturer. (and there certainly is NO ROOM at the plant for useless stuff).
Although there is a thriving overrun/junk micro industry in the area where RV junk and unused parts accumulate. If they have what you need, expect to pay quite a bit for it (just like at a junk yard) because you are paying for them to store all that other stuff they may never sell.
Warranty (within two model years max) parts MIGHT be available if the current production uses a similar part. Remember they are finishing up building the 2020 model year and will be starting the 2021 models soon (if they have not already started at some plants).
When you call the factory looking for repair parts for an old model, it is a crap shoot whether they can even be made at the factory and getting a matching color will most likely be impossible.
If you are willing to wait, the parts can most likely be special ordered by the plant. Expect to pay a lot here too. Some currently running process will need to be halted so the manufacturer can retool for your special part. Then they need to re-setup for what they were doing before the special order came in.
The BEST price is if you can wait for a model change on the line. That way they can slip your part in while retooling for the new production run.
Remember that colors and stains are not repeated. What they ship will most likely be close, but not exact.
Herk