13" non tilt window sash

Thanks for posting. This part is called a channel balance. It's an important distinction to make, since the sash is what you would call the glass panel that your balance supports. I have seen many Abbot and Costello routines play out as a result of those names being mixed up, so I just want to clear that up right off the bat so that there's no confusion moving forward.

Your balance in particular looks similar to our S385-13. This comes with a 19-005 top and 15-004 bottom nylon fitting. As long as the dimensions of these nylon fittings match your measurements, then I think the S385-13 will be a great choice to repair your window.