Window Replacement 19 5 JO CALDWELL

A quick learner from Washington says:
July 19, 2019
Need a replacement for my double hung window. 21 inches from the bottom to the top of the plastic. With 19 5 JO CALDWELL on the part not exactly sure do I get a 19 on the part or 21 by measuring bottom to top?
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Paul from SWISCO responded:
July 25, 2019

We offer two balances that may work in place of your current part. Take a look at our S380-20 and S385-20. The difference between these two balance lie within the measurement of the bottom balance shoe. So you will need to measure the depth of your bottom balance shoe, like in the diagram below, to determine which balance would make the best match. Whichever balance chosen will go with a 1950 option. 

Alternate view of 15-004
Alternate view of 15-004
20" Series 380 Channel Balance
20" Series 380 Channel Balance
S380-20
$9.38
20" Series 385 Channel Balance
20" Series 385 Channel Balance
S385-20
$9.38
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