Non even length Channel Balances

A quick learner from California says:
I am trying to identify the correct balance for my milguard window. I believe a series 380 20 inch is the correct balance, but I wanted to verify before I order.

Specifications as follows:

Non tilt window
19-5/8 length metal only
1/2 width
bottom foot 1 inch depth
20 lb window
Stamp 19-6

User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
We should be able to replace this, though it will have to be custom made. The Series 380 will not work in your window. Before we begin, can you just tell me how many you need?
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