Window balancer

A home owner from Skippack, Pa says:
August 1, 2016
I need 6 window balancers. I'm not sure what brand of vinyl window it is but it is builder grade for a 21 year old house. The metal tape is stamped 540. That is the only identifying number. Can you help me identify what parts I need?
User submitted image of their window hardware.
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Paul from SWISCO responded:
August 3, 2016
Thanks for posting. Please see our 15-180 pivot shoe, 15-181 support clip, 15-182 bushing, 33-073 screw, and finally the Series 190 coil spring. Based on your stamp, I'd go with the S190-540. Keep in mind you only need to replace what's broken. There's no reason you can't reuse undamaged hardware.
540 S190 Coil Balance Spring
540 S190 Coil Balance Spring
S190-540
$9.74
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
#8 x 1/2" Truss Head Stainless Steel Phillips Screw
#8 x 1/2" Truss Head Stainless Steel Phillips Screw
33-073
$0.23
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
Balance Bushing
Balance Bushing
15-182
$1.80
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