SWISCO - The Replacement Hardware Authority

Channel balance strength...

A contractor from Torrance, CA says:
30" Series 380 Channel Balance Product Code: S380-30

Not certain as to the strength of the spring. On the old channel balance there is a code of "29C USB"

That is the only information I can locate on the metal arm. Visually all other aspects match up to your diagram on line. I will be purchasing 5 sets (10 arms).
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Tom from SWISCO responded:
A stamp of 29C usually corresponds to our 2930 option, but you can always weigh your sash to confirm.
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