Identifying a Replacement Part

A handy person from Pahrump, NV says:
metal track is 27" numbering on the track is 26 4
see attached photos

I need the correct part number before I order 8 to 10 of these,

Thank you
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Emily from SWISCO responded:

Hi there!

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 will 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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