It's hard to find out because it has been 54 years since it was made. It doesn't have a lot of restoration potential because other models were more popular to restore.
I don't restore but when I looked at getting a 93 YZ/WR 250 again and building from scratch I found the availability of things extremely tough. FB Groups were the only thing that I saw had stuff. There really wasn't a central parts directory or anything except aftermarket stuff like plastic but even those only still made things for certain years back.
If you aren't already I would suggest joining a restoration group on FB or somewhere else and see what you can find. Unfortunately, they have a lot of scammers so buyer beware.
FWIW, my first bike was a DT100 and I bought a used one a long time ago to restore and gave up because I couldn't find anything... pistons were even hard to find. The RT180 had a lot that would swap over for the chassis but that was the best I could do.
Good luck
Ivan