Replacement part for double hung tilt old castle window

A handy person from Gainesville, Florida says:
July 20, 2022
There is a 29C stamped on the metal. Also looks like BSI. Gray plastic pieces broke.
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Emily from SWISCO responded:
July 25, 2022

Hey there!

Your balance appears to be a match for our S770-29 with the 29C strength option. Look over our specifications and see if you agree. 
29" Series 770 Balance
29" Series 770 Balance
S770-29
$12.80
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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