I have a broken channel balance from windows that were installed in condo built in mid '90's. Am sure these are original equipment. Rivet broke form spring is not repairable. Based on your fantastic guidance, I know the piece is 25" long and 1/2 inch wide. Stamp on channel is 24C Z, hope you might know what this means. Appreciate your recommendation on what exact balances I need. Will order 2 and replace both when I install.
Thanks for your help
Larry