Looking for proper replacement balance

A quick learner from Florida says:
February 3, 2024
This is a Lawson window with metal part of balance measuring 36" with a width of 1/2". Number looks like 3520 BSI. Looks like an S380 or S385? How do I determine whether it is a 380 or 385... I'm a bit confused as to what measurement on the foot determines which one it is. Thanks.
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Bob from SWISCO responded:
February 4, 2024

Thanks for posting. The difference between the Series 380 and Series 385 is the depth of the bottom nylon shoe, or the measurement from 'heel' to 'toe'. The diagram below illustrates this. Measure your old balance's shoe in the same way to determine which you need. Let us know if you have further questions.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
36" Series 380 Channel Balance
36" Series 380 Channel Balance
S380-36
$12.27
36" Series 385 Channel Balance
36" Series 385 Channel Balance
S385-36
$12.27
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