Silver line 8500 series

A quick learner from Essex ct says:
No markings on coil for LB s. 1.5 in wide. 1/2 in or 9/16 thick. Looks like your s180 spring. Single coil. Need about 10.
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Bob from SWISCO responded:

Thanks for writing. This does indeed look like our Series 180 Coil Springs along with the 15-087 Housing Shoe. If there are no stamps on the springs, weigh your window sash. Give us that exact weight, and we'll work out what you need.

A quick learner from Essex ct says:
weight of window sash is 15 pounds.
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Bob from SWISCO responded:

Thank you. You can go with the S180-8 coil spring. Take a look and let us know if any other questions come up. 

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