I have only seen the whole assembly.
The older ones are stainless on the outer/ forward channel and the newer ones are black .
Only separate prices I've seen for sale are the seal and the dealer use to sell the lock handles.
9 out of 10 people selling old ones say that theirs works fine when in fact, the bottom stud is broken. If there is no resistance in the motion of the window, it's just free floating in the pivot. They can be fixed, but it's a tricky weld.
1975 CJ-6 1983 CJ-8
1986 CJ-7 Laredo 1986 TJ-7 Trail Jeep
2003 Inca Gold TJ Rubicon