Those rails are usually made out of fairly light metal, but bending it back in shape would be tough. Home Depots carry garage doors and parts – you’d probably have to replace the entire side (3 parts on my house). It really helps to bring a picture with you (of the rail) and hope you find someone knowlegable.

At a home show a few years ago, I saw plastic tub rails for garage doors that made the opening and closing of garage doors almost silent. trying to find where I can purchase these rails.