Looking for replacement balance

A handy person from Florida says:
May 14, 2018
My balance is stamped (q 23 4 ) it looks like your 385 model being 5/8? but has 7/8? wings on both ends and a 1? shoe on the bottom. Your 385 is showing 15/16? wings and 1 3/32 shoe. Is it possible to get the size guide I need on that model. Please direct me in the right direction with this. The window weighs 16lbs.
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Paul from SWISCO responded:
May 18, 2018

Our S377-24 channel balance looks very close to the balance you are showing us. See if this is the replacement piece you are looking for. If so, you would choose a 2340 option to correspond to your "23 4" stamping. 
24" Series 377 Channel Balance
24" Series 377 Channel Balance
S377-24
$10.77
Top Sash Guide Pair, Pan Am
Top Sash Guide Pair, Pan Am
18-042
$1.97
Pan Am Take Out Clip
Pan Am Take Out Clip
16-023
$1.17
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