Sash Support Coil Balances

A contractor from Glendale, NY says:
I need what is in the attached pictures. The cover says part number 801020 and I included a front and rear picture. I can not find any stampings on the broken coils. The sash is 19 pounds, the coil is 1/2 wide.
Thank you in advance!
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Bob from SWISCO responded:

This looks like a 15-191 Pivot Shoe, which uses Series 160 1/2" thick Coil Balances. For a sash that weighs 19 lbs, I'd use (2) of the S160-4 4.5 lb springs on both sides of the sash. This equals 9 lbs of support on either side of the sash, for a total of 18 lbs of support overall--so long as the window sash weighs exactly 19 lbs, being within 1 lb should work fine. For new supports, see the 15-150D

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