B1 4 19 486 Andersen Balance

A quick learner from Connecticut says:
I have a small double hung Andersen from the early 1980's.
The numbers on both balancers are the same.
B1 4 19 486
This goes against everything I've read in my searching for the right part?
The one in my hand is from the left side.
Your advice is appreciated,
Chris
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Casey from SWISCO responded:

Hello,

It looks like you would need the 24-431 Andersen sash balance for your repair based on the 4 19 stamped on your original assembly. Note that this balance is used for the left and right sides of the window. Take a look and thanks for posting! 

A quick learner from Connecticut says:
Hello Casey,
Thank you so much for the information. I will be placing my order next week after I check another window that I have to do.
Chris
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