Rear side glass goes up and down hard.Cure?

Both my rear rollers are missing/broken. Any one have a source or know the right ones for a 73?
Looked at these two links but nothing for a 73.

http://www.autometaldirect.com/glass-glass-components-window-rollers-c-27_353_212.html

https://www.jimsautoparts.com/glass_and_ window_parts.htm