Simonton window problems

A home owner from walnut Creek says:
I have simonton double hung windows. Two of them flopped out and now are very hard to raise or lower. I think the springs are ok #6.5 35" pat 5232208, but I am guessing I need to replace most of the nylon/plastic. Please advise what you think needs to be replaced and provide the nylon/plastic part numbers. Also I need 1 of the round metal lock pieces. They flopped out because the parts that keep them from flopping out are broken, what is that part number?

Thanks a lot
User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting. I've associated some parts with this thread that may match what you're looking for. You can see my list on the right side of this page. Look them over and let me know what you think.
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