Correct sash balance

A quick learner from Oakland, CA says:
December 28, 2019
This is for a vinyl window. The glass is marked Oldcastle. Only the bottom sash moves and is removed by pushing the whole thing to the side and pulling it out of the channel. There is no tilt out. The balance is 27" long from end to end of the metal channel only. I am looking for the correct replacement part and was hoping for your guidance so I don't buy the wrong one. Thanks for the help!
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Bob from SWISCO responded:
December 31, 2019

See either our S380-27 or S385-27. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 2630. 
27" Series 380 Channel Balance
27" Series 380 Channel Balance
S380-27
$10.55
27" Series 385 Channel Balance
27" Series 385 Channel Balance
S385-27
$10.55
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