Help with what to order

A home owner from MA says:
October 18, 2021
I don't see a stamp on it, there is the number 4 on one of the coils.
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Lauren from SWISCO responded:
October 22, 2021

Hello, thank you for posting! 

Your pivot shoe resembles an older version of our 15-180 which is compatible with the Series 190 coil spring. Please compare the dimensions on the product pages to confirm a good match. If your coil is stamped with a #4, please review the S190-440. Individually, this coil balance can hold 4 pounds. This is added together with the other coils to support the whole weight of the sash. Please let me know if you have any questions. 
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
440 S190 Coil Balance Spring
440 S190 Coil Balance Spring
S190-440
$9.74
Balance Bushing
Balance Bushing
15-182
$1.80
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