Window balance Channel

A quick learner from Miami,Fl says:
To whom it may concern
The length of the window Channel metal to metal end 30 in
See photo above for plastic ends.
Could not find any numbers anywhere. I need to know your part number to order.
thank you, Mitchell Feldman
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Paul from SWISCO responded:

Many thanks for your correspondence. We can replace this 30" channel balance for you, but it will have to be custom made with the 19-042 Top Attachment and the 15-005 Bottom Nylon Attachment. If there is no spring number on the metal channel, we will need you to weigh the window sash. We will need that exact weight before we can get this order started for you. Many thanks.

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