Balancer parts needed

A contractor from Collinsville IL says:
I'll need 8 window balancers. The length is 35 " overall, the metal section without the plastic ends is 34" long. The width is 9/16" and the height is 5/8".
Will also need 6 plastic stops that screw into the top of the sash, there are right and lefts. Will need 3 each. The square top is 7/8"×7/8". They are 1 1/8" tall. The lower section is 3/4"wide.
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Tom from SWISCO responded:

Thanks for contacting us. I believe that your balance is either our Series 390 or Series 351, depending on the depth of the shoe. Look them over and see what you think. As for the top sash guide, I think this could be the top half of our 18-159P. Could there be more to this top sash guide still on your window?

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