Channel Balance Replacements

Hello,

I would like to ID and order the correct replacement part(s) for this channel balance, please.

I've included pics of the window label and the channel balance. The channel balance is 24 inches long without the fittings. The stamp on the back reads "23-3". The window was installed in 2007.

Thank you,
Stephen

Looks great, Emily! Thanks for your assistance and the part ID.