Single coil window balance

A quick learner from New Jersey says:
June 11, 2021
I am looking for the correct single coil window balances for a thermo tite. The front of coil cover has a "5" & "A,B,C,D,E,F" on the front. Any idea what replacement will fit?
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Bob from SWISCO responded:
June 15, 2021

See our 15-177 Pivot Shoe. This shoe uses our Series 152 Coil Balances. To know what spring weights to select, the only reliable stamp to go by would be on the spring itself, near the tongue. If there is none or you are uncertain, obtain the exact weight of the window sash. Give me that exact weight and I can work it out for you. 
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
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15-143
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Coil Bushing Cap
Coil Bushing Cap
15-144
$0.70
Coil Support Barrel
Coil Support Barrel
15-145
$0.49
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