these side tracks have some sort of spring ballast or balance that keeps the windows up, and prevents them from crashing down, [which is what they're doing now that these are broken]. Probably from the mid 1980s.
I'd need 6 for three windows left & right if you have them.
2 are about 33.5" long - 2 are about 33.75" long - 2 about 53.5" long
mike