Nuprime window balance replacement

A quick learner from 90807 says:
Balance specifications are 29" length x 1/2" width, stamp is 2630 BS. Top yellow fitting is 1 1/4" length x 1/2" width x 1/2" depth. Bottom black fitting is 1" length x 1/2" width x 1 1/8" depth.
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A quick learner from 90807 says:
Correction: Balance length is 27". Stamp is 2630 BSL.
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Bob from SWISCO responded:

See our S390-27. Look it over to confirm this matches up. For a new stamp option, choose 2630.

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