1600-17 Sash balance

A quick learner from Massachusetts says:
This is from an Anderson window in a 1984 home we just purchased. The pictures are from the right hand sash but I would like to replace both the right and left sash balance. I tried to take the best pictures I could but the numbers are extremely hard to read. the box measures 3 inches by 6 5/16 plus 1/2 inch overhang to screw it in.

I believe it says 1600-17 on one side but the other side is hard to read. I sent multiple pictures to see if that would help you.

Please let me know what I should be ordering.

I watched a great video from you guys that helped me find this part! Thanks.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for the pictures! They are a huge help. The key stamp here is 9#27. For that, I recommend our 24-939. This can replace Andersen balance boxes with that stamp.
A quick learner from Massachusetts says:
Thanks do much for your help! I just ordered the parts and I will let you know how I made out fixing the window using your wonderful video!
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