Window coil replacement parts

A home owner from Danbury Ct. says:
Hi,
I am tied of propping up my 23x36 bathroom window to get it to stay open ! I am hoping you can help me find the right parts to fix it. I have watched your videos and find my windo similar to those you use in your illustrations. The coil is 1/2 inch and I am including other parts which I likely need to replace. FYI I would need 2 sets, as both sides are broken. Photos attached.
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Bob from SWISCO responded:

Thanks for posting. Looks like you have either a 15-111 Pivot Shoe or its heavy duty variant, the 15-191 . These are compatible with Series 160 Coil Springs. Let us know if you need help choosing the correct spring weights. 

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