help with correct channel balance to order

A quick learner from San Diego CA says:
September 18, 2020

I have several sizes of the same brand. This one says

21 2 BSI na

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Bob from SWISCO responded:
September 23, 2020

The balance in your photos has  a stamp of 15-2 (or 1520) and appears to be either an S380-26 or S385-26, depending on the bottom nylon shoe depth. Compare both with your old hardware to see what matches best. 
16" Series 380 Channel Balance
16" Series 380 Channel Balance
S380-16
$9.34
16" Series 385 Channel Balance
16" Series 385 Channel Balance
S385-16
$9.34
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