Window balance

A quick learner says:
I need to buy window balances that are 15 inches long and 24 inches long they are identical to the pictures period I cannot figure out which one is the order . I also know how to switch out the springs if you have the correct springs for the 15 inch and 24 inch window balance.9/16 inch width. Thank you.
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Emily from SWISCO responded:

Hello there!

We appreciate you reaching out to us. Our Series 751 ribbed channel balance looks like a good match for what you show here. There should also be a stamp on the metal channel that will indicate what spring strength option you'd need for your replacements. Take a look and let us know if you have any questions. 

A quick learner says:
Can I just to order the springs?
15 and 18 inches for the heaviest window?
A quick learner says:
14 tg and 23 tg
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Emily from SWISCO responded:

My apologies for missing that. We don't sell just the springs, unfortunately. I am very sorry for the inconvenience. 

A quick learner says:
I meant to ask, can we buy the springs that fit the 15 inch 14 tg and 24 inch 23 tg balance for the window alone , just the springs?
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Emily from SWISCO responded:

I'm afraid we can only supply the whole balance, not just the springs. 

A quick learner says:
I need to order a pair of these right and left of these. they are attached to the window. Thank you so much.
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Emily from SWISCO responded:

Our 26-150 pivot pair looks similar. Review the dimensions and see how they compare with your old hardware. 

Dimensions for 26-150
Dimensions for 26-150

A quick learner says:
I'm not sure if I sent this message twice I was wondering if you sell the boards that hold the window balance.
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Emily from SWISCO responded:

Unfortunately we do not carry replacement jamb liners that the balances fit into. I apologize for the inconvenience. Please let us know if you have any additional questions! 

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