Window Channel Balance

A quick learner from Alhambra, CA says:
May 12, 2019
This is 22". Only marking is 2140Y. I need two of them. I don't know when they the windows were installed but the house was built in 1920. Any help is appreciated.
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Bob from SWISCO responded:
May 14, 2019

Thanks for posting. See our S351-22 or S390-22 Channel Balances. The only difference is the 'depth' of the bottom nylon shoe. Compare with your old balance to see what the best match is. You will need a stamp option of 2140. 
22" Series 351 Channel Balance
22" Series 351 Channel Balance
S351-22
$9.91
22" Series 390 Channel Balance
22" Series 390 Channel Balance
S390-22
$9.59
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