Help identify my channel balance.

A quick learner from Sacramento, CA says:
Dear Sir or Madam,

Given the pictures, can you help me identify which series would work with my window so I can purchase the correct one? It measures about 1/2 wide and about 22 inch from the very edge to the other edge. The only number on it is: 20-4 FE5 CMC 75. Thank you. I'd appreciate it.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I recommend that you look at our S385-21 channel balance with a 2040 option. Check it out and see if you agree.
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