Channel balance replacement for Florida Extruders International single hung, series 1000

A quick learner from orlando, florida says:
Hi,
My mother-in-law just bought a home by us and I need to replace channel balances for 3 of her windows. I have attached photos. The metal portion measures 29 inches. Can you please tell me which parts to order?

Thank You,
Kim
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
I see you were looking at our S385-29, but I think our S380-29 may be a better match. It really depends on the size of the shoe, but I can't tell what yours is, exactly. Look over our dimensions to confirm the best match.
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