27 inch channel balance marked 2640 bsi nl

A quick learner from Colorado says:
Replacing 27 inch channel balance marked 2640 bsi nl

These are hook and tackle. Not sure what parts to order for top and bottom, I think they are winged.
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Emily from SWISCO responded:

Hello there!

Thank you for your patience during our busy season. With this combination of attachments, you could have either an S380-27 or S385-27 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need a spring strength option of 2640.

If you have any further questions just let us know!

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
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