non-tilt window balance

A home owner from cocoa beach , fl says:
It says on it. 2310 24" long 5/8 by 9/16" as you can see the ends are particular. I believe you have these but I want to make sure. a 377 I believe. Thank you. Cathy
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hello, Cathy. Your balance appears to match our S377-24 Pan American side load balance. See what you think. I'd also recommend our 2310 option.
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