Need help IDing coil balance and pivot bar

A quick learner says:
The coil balance is just under 2-1/2" and I think it's part #15-177. My boss wanted to send the coil in to see how much weight it holds. We’re not sure. It’s 1/2" wide.

Also, the pivot bar is shorter than the pivot bar I found on your website. The pivot bar I’m trying to order is 2-11/16" long.
User submitted photos of a coil balance & pivot bar.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting! I agree, that pivot shoe looks like our 15-177. How about 26-226 for the pivot bar? That looks similar. What do you think?

For the spring, you may want to look at our Series 152 coil. Does your coil spring have a number on it? Let me know.
A contractor from Taunton, MA says:

Yes, these parts look like the right ones. Thank you for your help.

I have no idea how many pounds the coil is supposed to support and there is no number stamped on it.

Profile picture of Tom
Tom from SWISCO responded:
Do you know how heavy your sash is? You may have to remove it from the window and weigh it on a scale.
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