Andersen Sash Balance Replacement

A quick learner from Massachusetts says:
Hi, I need help determining what replacement sash balance is needed. The ones I am replacing are over 30 yrs old. Please refer to photos. Thank you
Thumbnail of the uploaded file named IMG_1901.JPG
Thumbnail of the uploaded file named IMG_1902.JPG
Profile picture of Bob
Bob from SWISCO responded:

Thanks for posting. It's a bit tough to read the stamp, but I believe the middle clump of codes reads 5p23, or 5#23. You may want to check the other balance from the window to confirm. If that's indeed the case, see our 23-531. This is meant to replace Andersen balances that include the stamp 523, or 5p23 or 5#23. 

How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
VIDEO
WATCH >
Andersen's Narroline Sash Balances
Andersen's Narroline Sash Balances
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.