Need help- window balance weight?

A handy person from Sacramento says:
I plan to 30" Series 351 Channel Balance (2960) to replace a broken one in my non-tilt window. My question concerns what is stamped on the balance. It says, "29 6 HS or H5 Caldwell."

The reference numbers provided are 4 digit and the numbers on my balance are 3 digit.

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Tom from SWISCO responded:
A stamp of 29 6 usually corresponds to our 2960 option. You can also weigh your sash and refer to the S351-30 option chart to confirm.
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