Parts parts parts

I have a 2013 TE 449. I dented my header pipe pretty good and went to order a new one from motosport, and it is on backorder and I also noticed some other parts aren’t even available for our bike, specifically transmission parts. So, what would happen if you’re transmission goes? Does Husqy simply not make some parts for these bikes anymore? Would you have to find a needle in a haystack and find used parts for a TE?

How do you guys source parts/ look at this issue?

the 5-speed bmw tranny fits in and IMHO has a better spread, and is stronger; although it's a 5 speed (so: all-or-nothing). don't speed shift etc, and you'll be fine for a normal lifetime.