Nuair window channel balance

A quick learner from Naples, FL says:
Greetings! I have a number of Nuair windows that need channel balances, and I wanted to get the correct ones. My balance is marked 34-4-FU-CMC-2. I have a 19-005 top, but I can't decipher whether I need a 15-004 or 15-005 bottom. How do you tell? Any help would be appreciated, thank you!

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Tom from SWISCO responded:
Thanks for posting, Matt. Have you compared the dimensions of both shoes to your own hardware? The 15-004 and 15-005 are different sizes.

Comparison of 15-004 & 15-005
Take a look at our 15-004 and 15-005 channel balance shoes, and note their depths. As you can see, they are 1-3/32" deep and 1" deep, respectively.
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