Nuprime window balance replacement

A quick learner from 90807 says:
December 16, 2020
Balance specifications are 29" length x 1/2" width, stamp is 2820. Top fitting is ? length (broken) x 1/2" width x 1/2" depth. Bottom fitting is 1 1/8" length x 1/2" width x 1" depth.
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Bob from SWISCO responded:
December 18, 2020

See our S351-29 and S390-29. Compare both with an undamaged version of your balance just to be certain that this matches up; let me know if anything differs. The key difference between these two Series is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement; compare both with your old hardware to see what matches best. In either case, use a stamp option of 2820. 
29" Series 351 Channel Balance
29" Series 351 Channel Balance
S351-29
$11.10
29" Series 390 Channel Balance
29" Series 390 Channel Balance
S390-29
$11.10
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