Caldwell Spring balance 21-4

A contractor from Bakersfield, Ca. 93307 says:
To whom it may concern.

I need these spring balances identified so I can order them. I need two of them.
Photos(5) included of ends as requested.

Metal rail is 1/2" x 22" long.
Spring force is 21-4

I also need the part that attaches to the window that mates with the balance(see last photo). Thank you.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Sure, please see our S385-22 to start out with. I would also recommend the 2140 option. For the top sash guide, consider our 18-171.
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