Window balance 33b depth1/2 in width 5/8 special guide connection

A professional from Tecumseh mi says:
Can identify subject description
Length 33b bsi j
L 33 w5/8 depth 1/2 square guide connection no end pieces just channeled please see pics attached need a dozen
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Casey from SWISCO responded:

Hello,

Take a look and compare the S770-33 channel balance with a 33B strength option to your assembly. Thanks for posting!  

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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