Vinyl window balance

A contractor from Dover de says:
November 10, 2017
Hello. I think I found what I need but just want to get a second opinion. The window only weighs 18lbs but it has a double coil. The lowest double coil you sell is for 22 lbs. S140-11. This looks like the right part. Minus the screws. Mine has two screws to hold it in. The t bar. 26-378 looks to be correct for a replacement. I
coil balance
A contractor from Dover de says:
November 10, 2017
Was looking again at my options. I actually have the spring carriers and they are fine just the springs are bad/broken. I think I can just order the springs instead. Which ones would be correct to lift the 18 lb window. Again, I have two coils on each side, so the coil strength should be around 4.5 lbs?

Thanks!
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Tom from SWISCO responded:
November 15, 2017
Thanks for contacting us! Your shoe looks like our 15-199, which is commonly used with the 1/2" wide Series 160 coil spring. See what you think. For an 18 pound sash, I think using four S160-4 springs would be perfect.
Pivot Shoe, 17/32" Thick
Pivot Shoe, 17/32" Thick
15-199
$3.70
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