Identifying balances for replacement

A home owner from Grass Valley, California says:
I have a few windows that need the balances replaced. theonly markings on them are 2740 and the other 2140 as shown in the attached photos. What is the order number and cost on these? Thanks, Gary
Thumbnail of the uploaded file named 2140 2740 stamped channels
Thumbnail of the uploaded file named wingless bottom shoes
Thumbnail of the uploaded file named wingless top fittings
Profile picture of Emily
Emily from SWISCO responded:

Thanks for reaching out to us, Gary! It looks like you may have the Series 351 or Series 390 depending on the depth of the bottom shoe. You'll have to measure as shown below to determine the best match.

For the 28" balances with the 2740 stamp, you can use the 2740 option. For the 22" balances with the 2140 stamp, you can use the 2140 option. 

Pricing for these parts can be found on their respective store pages as well. Let me know if you have any questions!

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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