Channel balance

A contractor from Santa Barbara says:
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:

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. 

S380vsS385
S380-29 : 29
29" Series 380 Channel Balance
S380-29
$10.05
VIEW >
S385-29 : 29
29" Series 385 Channel Balance
S385-29
$10.05
VIEW >
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