Need help identifying spring replacement for tilt window

Quick Learner from Virginia
I have some tilt windows, and I need to replace all the hardware pieces. I'm stumped on the spring, the ones on there right now are double springs. The top of the spring assembly needs to be rounded/beveled/sloped to let the tilt catch pass over without breaking the plastic.

I pulled out one of the windows and it weighs 8 lbs 11.5 oz.

The current springs have a few markings:
#5.0 35"
PAT5232208
5 user uploaded images
2 Replies
Bob
Bob from SWISCO
SWISCO
Expert

This is a 15-199 Pivot Shoe, which uses either Series 160 1/2" thick springs or Series 165 3/8" thick springs. Please remove your old assembly and measure the spring thickness to confirm. See the video below.

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