Channel balance

A contractor from Santa Barbara says:
October 8, 2021
Channel itself is 29" long

Numbers stamped on channel #1 is 2830 BSI AR
Numbers stamped on channel #2 is 2830 BSI AT

I have one channel on the left side of the window frame and the other on the right

I wish to purchase both sides.
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Bob from SWISCO responded:
October 13, 2021

This appears to be either an S380-29 or S385-29. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option choose 2830. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
29" Series 385 Channel Balance
29" Series 385 Channel Balance
S385-29
$11.10
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