Can you tell me what parts I should purchase?

A quick learner from San Gabriel, CA says:
I am in need of replacing (2) CertainTeed window Pivot Shoes, Old Style. (2) CertainTeed Coiled Springs, 3/4 Wide. (2) CertainTeed Lance Spring Covers, Wide. Basically, the top part of my CertainTeed Double pane tilt window is, extremely, difficult to raise up and down. I would like to replace all the components will fix this. Can you, please, let me know what parts I need to purchase? Thank you for all your help
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Emily from SWISCO responded:

Hello!

Take a look at our 15-192 CertainTeed pivot shoe, which uses the Series 170 and Series 171 coil springs, and compare the dimensions to yours to see if this matches up. If you're not sure what coil weight to choose, look for number(s) stamped on the spring. If there aren't any or if they're too faded to make out, you'll need to weigh your sash and divide the weight by the number of coils on both sides of the window to determine the correct strength option.

If you need a new coil cover, see the 15-156 and 15-157 . Let me know if you have any questions! 

SWISCO S170 and S171 Coil Balance Assembly
SWISCO S170 and S171 Coil Balance Assembly
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How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
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How to remove window pivot shoes
How to remove window pivot shoes
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Anatomy of a tilt window
Anatomy of a tilt window
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