Window coil balance

Hello,

It's tough to be sure with your hardware still installed but your pivot shoe resembles the 17/32" thick 15-199. This shoe is used with either the 1/2" Series 160 or 3/8" Series 165 coil springs, along with the related items shown on our product pages. I would recommend removing your assembly from the window to compare to our replacement parts. Thanks for posting! 

Alternate view of 15-199