MI mtl-2 Series 3500 window built in 2005 coil balance

A home owner from Reston, VA says:
August 24, 2022
This is MI mtl-2 Series 3500 window built in 2005. A few of bottom windows keep dropping when opening. It seems the coil balance shoes are broken. I took the picture. Would you please take a look and please tell me what the part number is? Do you have the parts? Thank you!
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Emily from SWISCO responded:
August 26, 2022

Hi there!

Sure, this looks like a match for our 15-180 shoe which is designed to be used with the Series 190 coil springs and 15-186 balance clip. Look these parts over and let me know what you think. 
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Coil Balance Clip
Coil Balance Clip
15-186
$5.05
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