Replacement for Milgard Window Balance

A home owner from San Ramon, Ca says:
Looking to purchase 4 individual replacement parts to fix 2 window but can't seem to find this anywhere.
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Lauren from SWISCO responded:

Hello, thank you for posting! 

With this combination of attachments, you could have either an S380 or S385 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.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
The length of your channel should measure 27" and the stamp option needed with be 2640. Please let me know if you have any questions! 
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