Replacement Caldwell Balancers 37 3 FN Caldwell

A quick learner from San Francisco says:
February 17, 2022
We want replacement 10 sets of balancers for 37 3 FN Caldwell. What do the numbers mean? See attached photos. The channel is 1/2 inch and the interior length is 37" the bottom piece seems to be 1"wide.

Let me know if you need any other info to id.

Thank you

We used to be able to obtain these locally butt our source is no longer in business. We owned a large apartment building so have replaced many balancers over the years but these are for our own residence.
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Bob from SWISCO responded:
February 18, 2022

We may be able to help, but we'll need more information to help. That stamp just tells us the strength of the balance. To know what you need, I'd like to see pictures of the nylon fittings on both ends of the metal channel. Also, could you confirm the length of the metal channel? A balance with a stamp starting with 37 is usually actually 38" long, so I'd like to be certain. 
A quick learner from San Francisco says:
February 18, 2022
yes it is 38inch total length.
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Bob from SWISCO responded:
February 18, 2022

Perfect, thanks. This looks a lot like our S380-38 or 385-38. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. See the image below. For a new stamp option choose 3730. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
38" Series 380 Channel Balance
38" Series 380 Channel Balance
S380-38
$13.87
38" Series 385 Channel Balance
38" Series 385 Channel Balance
S385-38
$13.45
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