Balances for windows manufactured by Northwest Aluminum Prod

A quick learner from Sedro Woolley says:
Originally for Windows manufactured by Northwest aluminum products. The balancers are stamped BSI on both. One is numbered 1820. The other is numbered 11220. They are identical other than the length
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Emily from SWISCO responded:

Hello there!

For the balance stamped "1820", you could have either an S380-19 or S385-19 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'll also need a spring strength option of 1820 for this replacement balance. 

As for the balance stamped "1220", can you show us some pictures of the bottom shoe from a different angle? I just need to confirm if it has "wings" or not.

Thank you!

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A quick learner from Sedro Woolley says:
These were taken off the ends of the small balance.
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Emily from SWISCO responded:

It's difficult to say from these pictures. Do both of these fittings have 'wings' like the other balance stamped "1820"? 

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