Broken coil balances

A handy person from New Jersey says:
Hi, I have Cardinal series 8501 windows in my home and the coil balances on one of the windows are broken. I attached images that will hopefully help determine what replacement coils are needed for my window. If you need any more details, please let me know. Thanks, Jeff
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Bob from SWISCO responded:

Hey Jeff. I believe this is a 15-087 Coil Balance Shoe and 15-086 Housing. This system uses our Series 180 Coil Balances. To know what spring weights to select, you'll need to remove the assembly and look for stamps on the coils themselves. if there are none or you're unsure, give me the exact weight of the window sash, and I can work it out for you.

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