Spring replacement question

A quick learner from Princetown, New York says:
I need both left and right spring assemblies. It is a double hung window. The lower sash is where these springs will go. The are 2 springs on each side even though the picture I sent only shows one. The lower sash is approximately 20 inches high and 30 inches wide. I'm not sure which springs to order. Can you help?
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Paul from SWISCO responded:

Starting with your pivot shoe, see if our 15-111 would make a good fit. These are used with the Series 165 coil spring. We will need to know the number that is stamped ion the coil spring. If there is not a number on the spring, we will need for you to get back to us with the weight of the window sash. 

A quick learner from Princetown, New York says:
Thanks for the response. The number on the spring is 4.The 15-111 shoe looks just like mine. I think we're on the right track. What spring assembly do you recommend?
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Paul from SWISCO responded:

Take a look at our S165-4 coil spring. See if this would make a good match.

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