Window coil balance shoe & coil

A contractor from King of Prussia, PA says:
Need (2)two sets - Top = Left,Right and Bottom = Left, Right
The window is a Weather Craft, both top and bottom tilt
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Bob from SWISCO responded:

See our 15-158 Coil Balance Shoe. This shoe uses our Series 152 Coil Springs, as well as the 15-143 , 15-144 and 15-145 support components. Let me know what you think. 

A contractor from King of Prussia, PA says:
I will also need two springs(one left & one right side) for this type of shoesystem
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Bob from SWISCO responded:

You will need our Series 152 Coil Balances. Look for stamps on the coil springs that designate the spring weights you need to select. If there are none or you are uncertain, give us the exact weight of the window sash and we'll figure it out for you. 

A contractor from King of Prussia, PA says:
Components are for a double hung window

I put in my order for:(4) 15-158 Coil Balance Shoe,(4)152 Coil Springs,(4) 15-143 ,(4) 15-144 , (4) 15-145 support components and #8X3/8" SS pan head screws

I didn't see anything to order a left side - right side
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Bob from SWISCO responded:

This particular coil balance system is non-handed, meaning that it can work on either side of the window sash. 

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