Coil Balance replacement part

A quick learner from Albuquerque, NM says:
One of my coil balances broke and I need a replacement.
Dimensions: 1/2" wide, 3/8" tab, at least 24" long.
It is marked with an "8" at the end.
I think I need a 160 but don't know whether to order a 7.5 or 9#.
Thank you.
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Emily from SWISCO responded:

Hello!

Can you upload some photos of your pivot shoe? If we can identify the pivot shoe, that will tell us the coils and accessories that you'll need.

A quick learner from Albuquerque, NM says:
There are no manufacturer's markings that I can see. Photos attached. Thanks.
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Emily from SWISCO responded:

Thank you for the additional photos! This is a huge help. We don't carry this exact pivot shoe but our 15-228 , which uses the 1/2" Series 160 coil springs, is similar in design to what you show here. I can't promise they will work but take a look at the specifications and see what you think. The Series 160 doesn't have an 8 pound weight option so you'll have to divide the sash weight by the total number of coil springs in the window to determine the appropriate weight calibration. 

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