Single Hung window window balance parts

A quick learner from Brooklyn park says:
January 9, 2021
Each coil had the number 5 or 6 on them there were 2 coils in the plastic container but it looks like there was a third coil underneath it.
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Bob from SWISCO responded:
January 12, 2021

This appears to be our 15-180 Pivot Shoe. This shoe uses our Series 190 Coil Balances. Stamps of 5 and 6 would indicate you need the S190-540 5 pound and S190-640 6 pound springs, respectively. If you're uncertain about other spring weights needed though, give me the exact weight of the window sash, and I can work it out for you.
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
540 S190 Coil Balance Spring
540 S190 Coil Balance Spring
S190-540
$9.74
640 S190 Coil Balance Spring
640 S190 Coil Balance Spring
S190-640
$9.74
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