Need help for identifying channel balances

A quick learner from Sammamish, WA says:
July 14, 2020
Hi,
I'm confused whether I need to buy Series 380 or 385 Channel Balances. Top looks quite obvious, but not sure about shoes (should I include the wing to the length?)

FYI, It was 0.5 inch wide and 21 inch long. Also I can see "20 4 KP CALDWELL"

Thanks,
Junho
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Casey from SWISCO responded:
July 16, 2020

Hello,

To choose between the S380 and S385, follow the diagram below demonstrating the depth of bottom attachment for each balance. Thank you!

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
21" Series 380 Channel Balance
21" Series 380 Channel Balance
S380-21
$9.38
21" Series 385 Channel Balance
21" Series 385 Channel Balance
S385-21
$9.38
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