Broken window coil

A quick learner from California says:
October 4, 2020
Hello, I'm hoping to find a replacement for these window coils. I believe the coils have snapped, which is why I don't have any pictures of how the parts are installed before they were broken. The only markings on the parts are "7R". My window is approximately 13 pounds. I couldn't find parts that looked identical to these on your site, so any advice as to a replacement would be helpful.

Thank you!
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A quick learner from California says:
October 4, 2020
Followup: I found a number on the wire coil that says "7z". It seems like the only part which is broken is the coil, so perhaps I only need to replace the coil?
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Bob from SWISCO responded:
October 8, 2020

Thanks for posting. I believe this is just an older version of our Series 140 Coil Balance system. A stamp of '7' would indicate you want the S140-7 7 lb system. Having one of these on each side of the sash would equal 14 lbs of overall support, which is close enough to your exact sash weight of 13 lbs. Let me know if you have further questions. 
7 lb Series 140 Quick-Tilt, Single
7 lb Series 140 Quick-Tilt, Single
S140-07
$7.97
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