Non-tilt balance replacement

A handy person says:
March 30, 2020
They measure 1/2" across and the length is 19". The sting on the one balance busted.
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
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Casey from SWISCO responded:
April 1, 2020

Hello. Have a look at both our S380-19 and S385-19 channel balances. These look very similar to your balance. The only difference between these two balances is the 'depth' measurement of the bottom balance shoe. You will need to measure the depth of your bottom shoe, the way it is shown in the diagram below, to determine which of the two balances is the better match. If I zoom in on your photo, I believe I can read "18 4" for the stamping. Could you confirm? If so, then whichever one chosen will go with an 1840 option that supports a sash weight of 14-17 pounds. 

Alternate view of 15-004
Alternate view of 15-004
19" Series 380 Channel Balance
19" Series 380 Channel Balance
S380-19
$9.34
19" Series 385 Channel Balance
19" Series 385 Channel Balance
S385-19
$9.34
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