Sash String is Torn

A home owner from Middletown NJ says:
The right sash string tore and I can't keep the bathroom window open. The glass shows Anderson MC 90-2 XL. The left sash string is missing.
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Emily from SWISCO responded:

Thank you for reaching out to us! I'm afraid we can't identify what Andersen balances you may need from these photos. In order to help, we will have to see a clear photo of all the numbers stamped on your balance box. 

A home owner from Middletown NJ says:
The window pane is marked MC 90-2 and the size is 20 1/2" x 16".

The numbers on the sash balance are: 519 3 BJ31 7 90 H600A-3 11600-1

I need to replace both sash balances.
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Emily from SWISCO responded:

Thanks for getting back to us. Take a look at the 24-531 Andersen sash balance. This is designed to replace balances that have the 519 stamp. Review the specifications and see what you think. 

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