Replacing channel balances

A home owner from Grand Prairie TX says:
Hello. I am going to replace the channel balances of 15 windows and need to make sure I order the correct ones. I think the ones I need to order are 390-28 but please confirm for me. The measurements are 28in x 1/2 in. My windows are non tilted and there are no wings on the guides.
A home owner from Grand Prairie TX says:
These pics are from 1 window different from the others... it's heavier and the measurement is 22in by 1/2in. Not sure if it matters but my house was built in 1989.
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Lauren from SWISCO responded:

Hello, thank you for posting! 

It looks like you have either our S351-28 , with a 15-002 bottom attachment, or S390-28 , with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
Once you determine which series is needed, you will need a 28" length with a 2730 stamp option and a 22" with a 2140 stamp option. Please let me know if you have any questions! 
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