Coil spring balance replacements

A contractor from California says:
February 8, 2024
Hello I'm a contractor in California. I inspected a window today and pulled these out. Both casings the same size approx 4"x 1"
However the coil stamp pound indication was different. In one I pulled out a 4lb and 6lb coil. The other had both 5lb coils. The window that had the 4 and 6 lb coil wasn't holding the window up so I think it was replaced maybe with wrong coil. I'm not 100% sure but that's what i think. I need replacements if you have. ThNk you
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Bob from SWISCO responded:
February 10, 2024

Thanks for posting. This looks like the 15-102 Double Side Carrier, which uses Series 145 Coil Balances. Also see the 15-108 Sash Cam, 15-222 Guide Base, and 15-223 Guide Cover.

As far as the window not staying up, the best thing to do is to weigh the window sash. Having 4lb and 6 lb springs on one side is actually equal to having (2) 5 lb springs on the other side; however, it is possible this simply isn't enough overall support for the window weight. Let us know what that exact weight is, and we can narrow down what you need. 
Double Side Load Carrier
Double Side Load Carrier
15-102
$2.65
Sash Cam
Sash Cam
15-108
$1.28
Sash Guide Base
Sash Guide Base
15-222
$1.40
Sash Guide Cover
Sash Guide Cover
15-223
$1.22
4 lb Series 145 Balance Spring
4 lb Series 145 Balance Spring
S145-4
$3.64
5 lb Series 145 Balance Spring
5 lb Series 145 Balance Spring
S145-5
$3.65
6 lb Series 145 Balance Spring
6 lb Series 145 Balance Spring
S145-6
$3.90
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