The shoe of these coil balances broke.

A quick learner from Washington dc says:
June 6, 2020
This broke causing my window to fall down this week.

Attached are the pictures I took today. Is that common for both shoes to break in almost the exact same way at the exact same time?

I haven't taken them out yet, I don't believe there is a cut out

Is it better to replace the shoe, or is it just the entire coil assembly?

Thanks,
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Bob from SWISCO responded:
June 10, 2020

See if your Pivot Shoe resembles our 15-180. This shoe uses our Series 190 Coil Springs. 
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
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