window channel balance replacement part 1/2 inch width , length 16 inch & 22 Inch.

A quick learner from La CA says:
My smaller window old part shows Part No. 1510A, question:

1. should I use series 350?

The much bigger window have no parts number, after I match with the picture, I believe that I should use series 351 or 390, both with the same top, question:

2. What is the different between shoe 15-001 and 15-002?
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Tom from SWISCO responded:
I'm afraid I cannot determine what Series you have based on the stamp alone. All that tells me is how strong the spring is and how long the balance should be. The difference between the 15-001 and 15-002 is the size. You will have to measure yours and refer to our measurements to confirm the better match.
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