Window coil balance

A handy person from Reading, PA says:
March 30, 2024
What should we reorder? Metal coil is 1/2" wide and has the numbers 246D Z with a 1 under the D and #6.5 354.The gray shoe is 1/2" deep, 1" in length and 1 1/4" wide and has Patent 4,610,108. The white coil housing is 1/2" deep, 1 11/16 in length at it's middle, and 1 1/4" wide and has the numbers Patent 0's 5,232,206; 5,365,638; 6,584,644 B2.
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Bob from SWISCO responded:
March 31, 2024

Thanks for posting, and for the thorough information. The pivot shoe looks like the 15-191. For the coil balance, use the S160-6 1/2" thick 6.5 pound spring. For a new cover for a single coil, use the 15-150S. Let me know if you have any questions. 
Heavy Duty Pivot Shoe, 1/2" Thick
Heavy Duty Pivot Shoe, 1/2" Thick
15-191
$2.57
1/2" Coil Single Support
1/2" Coil Single Support
15-150S
$1.10
1/2" Coil Double Support
1/2" Coil Double Support
15-150D
$1.57
6.5 lbs Series 160 Coil Balance
6.5 lbs Series 160 Coil Balance
S160-06
$4.85
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