spiral balance

A quick learner from Reisterstown, Md says:
My windows are 29 years old. In January I was able to order a 12" Series 600 Spiral Tilt Window Balances and pivot shoes. After a lot of struggling ( I'm only 5'1" tall). I was able to fix my bathroom window which was stuck open. Now I am having the same problem in another room. My balances are 17" on this window. I am not sure what color to order because the bottom of this window has red balances that are working and I can only see one side of the top balance which appears to be white or faded orange/ yellow. The guy who installed the windows 29 years ago was drunk so I can't verify that he used the right balances. Should the top balances match the bottom balances? Does it matter if I order the red for the top instead of the white? It's hard for me to remove the window from the sash so I prefer to do it once I have the parts. ( I could use longer arms and a taller body ). Got any suggestions other than removing the window and weighing it?
A quick learner from Reisterstown, Md says:
obviously you didn't read my entire message: Series 600 Spiral Tilt Window Balances are the balances I bought previously for my tilt windows all the windows in the house were installed at the same time. here is what I previously ordered for my other window and it worked:
Product Code Quantity Price/Ea Total

Pivot Shoe, 17/32" Thick 15-015 4 $1.44 $5.76
12" Series 600 Spiral Tilt Window Balance S600-12 2 $6.48 $12.96
option: white-tip

My order number was 849800. It was in January. The balances are the same width I just need a 17" balance for this window. does it matter if I use a red balance instead of a white? Should the bottom balnces match the top balnces in color?
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Paul from SWISCO responded:
For your new project, are the windows from the same company? If so, you can use a 15-015 pivot shoe, like you did before. The length of the window balance you are now working on is 17", with an orange or red tip. Go with S600-17 with a red tip for this. You will need to check the top sash for the correct length balance, because some manufacturers use different lengths between top and bottom sashes.
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