Do you sell these Nami/Dura Trust Springs?

A home owner from nj says:
March 26, 2024
I have a double hung vinyl window marked Nami and Dura Trust. one of the springs has broken and I can't hold the bottom window open. I need a new spring for the one side. Thanks. I believe it is an inside sash 24x48. pics of intact spring, and broken spring where coil is at bottom of window.
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Bob from SWISCO responded:
March 27, 2024

Thanks for posting. This looks like a 15-087 Balance Shoe. This uses Series 180 Coil Balances. That 7 on the shoe might indicate you need an S180-7 7 pound spring, but to be safe, look for a stamp on the actual spring. If there is none, give me the exact weight of the window sash; I can work out the spring weights needed from there. 
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
7 lbs Series 180 Coil Balance
7 lbs Series 180 Coil Balance
S180-07
$4.97
Mounting Bracket
Mounting Bracket
16-024
$0.66
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