Parts

A quick learner from NJ says:
May 9, 2019
I couldn't find any markings on the part or window. I think the window is 20-21 pounds based on my weight with and without holding the window. I would need 3 left and 3 right although they looked identical.

thanks
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Bob from SWISCO responded:
May 10, 2019

Thanks for posting. This looks like a 15-180 Pivot Shoe, which is compatible with our Series 190 Coil Springs. So long as your window definitely weighs between 20 through 21 lbs, I think going with a pair of S190-540 5 lb coil springs on either side of the window sash (for 10 lbs of support on either side, equaling 20 lbs of support total) should work--generally with coil springs, + or - 1 lb is acceptable. If you need new housing, see our 15-181 and 15-182.  
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
540 S190 Coil Balance Spring
540 S190 Coil Balance Spring
S190-540
$9.74
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
Balance Bushing
Balance Bushing
15-182
$1.80
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