Tandem constant force balance #6 with cam and #7 for vinyl double hung

A quick learner from Shrewsbury, Ma 01545 says:
June 22, 2022
Looking for parts for silverline window balance. Pics and subject have all info. Tandem constant force balance #6 with cam; and #7 for vinyl double hung window. Left side from inside. Top housing marked with a 7 and coil inside marked with 7DK (pretty sure housing 15-086). Bottom housing has blue cam and is marked with a 6 and coil inside marked with 6DK. Looking for complete setup including mounting bracket both coils both housings. If possible non plastic cam. Thank you
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Emily from SWISCO responded:
June 24, 2022

Hello there!

Your pivot shoe looks like a match for our 15-087 which uses the Series 180 coil springs, 15-086 housing and 16-031 mounting bracket. Since your housing is marked with a "6" and "7", you'll need our S180-6 6 pound and S180-7 7 pound coil springs. Look these parts over and let me know if you have any questions. 
Tandem Coil Housing
Tandem Coil Housing
15-086
$1.68
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
Mounting Bracket
Mounting Bracket
16-031
$0.90
7 lbs Series 180 Coil Balance
7 lbs Series 180 Coil Balance
S180-07
$4.97
6 lbs Series 180 Coil Balance
6 lbs Series 180 Coil Balance
S180-06
$4.45
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