Replacement Coil Balance system

A handy person from Milford, MA says:
February 19, 2017
So I have two windows that are the same size, they are both vynal double hung / tilt windows. One of the windows the previous owner removed both coil balances from the lower window so they could push it all the way up to insert an AC unit in the window. I am now selling and the new owners want it fixed but I don't have any of the parts.

So I pulled the coil balance out of the bathroom window that is the same size, for the bottom half. Attached a picture.

The window is 19 1/2 inches High by 27 inches wide, and it weighs about 11 pounds. The coil has a #7 on it. Do I have to buy the exact same type of coil balance, or can I use the S140 series you have on your site that looks like the complete system (all the parts).

If I can use the S140, should I go with the 5 lb or 6 lb L/R unit for a 11lb window.

If I need to get the parts, can you recommend which?

coil balance
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Paul from SWISCO responded:
February 23, 2017
Thanks for posting! I don't believe our Series 140 will work, no. I've made a list of parts for you to consider on the right side of this page. Keep in mind that you only need to replace what's broken.
A handy person from Milford, MA says:
February 23, 2017
The issue is that there are no parts, they previous owner removed the coil balance system from the lower window and threw them away. The one I have a photo of is from a different window in the house.

So with that in mind, that I am replacing everything, should I still go with the individual parts, or can I just us a different system?

Also, the parts you listed, would I need two sets, one for each side of the window?
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Paul from SWISCO responded:
February 28, 2017
Assuming the window from which you pulled this balance is identical to the one missing it, then you should stick with the recommended hardware. You would need to order two of each, one for each side of the window.
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Balance Bushing
Balance Bushing
15-182
$1.80
Coil Balance Clip
Coil Balance Clip
15-186
$5.05
#8 x 3/8" SS Pan Head Philips Screw
#8 x 3/8" SS Pan Head Philips Screw
33-072
$0.30
540 S190 Coil Balance Spring
540 S190 Coil Balance Spring
S190-540
$9.74
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Anatomy of a tilt window
Anatomy of a tilt window
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How to Replace a Triple Coil Balance System
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