Channel Balance stamp

A contractor from La Mirada says:
Hello.
I am looking to replace a pair of channel balances. They both had same stamps. They both measured 21" x 9/16". It is for a double hung window
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Emily from SWISCO responded:

Hi there!

I recommend the S770-21 channel balance with the 21D strength option based on what I see in your photos. Take a look and see what you think. If you have any questions just let me know! 

A contractor from La Mirada says:
Hi Emily.
Thank you yes that looks like this style would work. But I did weigh the sash and it weighed 23lbs so I might go with the E stamp. Are these prices individual or per pair?
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Emily from SWISCO responded:

These balances are sold individually! 

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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