Coil spring balance

A quick learner from Virginia, USA says:
I am trying to replace coil spring balance.
But, I have no idea which one to buy.
It has mark of "8R" (left one has mark of "8L").
It also has "PAT5,353,548" on it.
I am also including tag from window itself.
Please help me with identifying.
Thanks,
Thumbnail of the uploaded file named 20221101_165759.jpg
Thumbnail of the uploaded file named 20221101_152440.jpg
Thumbnail of the uploaded file named 20221101_171329.jpg
Profile picture of Casey
Casey from SWISCO responded:

Hello,

Your balance assembly actually looks like a match to the 15-087 housing pivot, which uses the 15/32" wide S180 coil springs and the other related items found on our product pages. If the coils are stamped with 8L and 8R, see the S180-8 . Take a look and see how the specifications compare to yours. Thanks for posting! 

A quick learner from Virginia, USA says:
Thanks for the quick reply.
How about S161-08 ?
It looks like it has everything I need.
Or
Do you suggest getting the 15-087 housing pivot and S180 coil springs separately?

Thank you,
Profile picture of Casey
Casey from SWISCO responded:

Unfortunately, the S161 would not be a suitable replacement for your balance assembly. It is important to get exact matches for your original hardware to ensure that the window will function properly, which is why we recommended the 15-087 and the compatible coil balance accessories. 

How to remove window pivot shoes
How to remove window pivot shoes
VIDEO
WATCH >
Anatomy of a tilt window
Anatomy of a tilt window
VIDEO
WATCH >
How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
VIDEO
WATCH >
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 4-7 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.