Parts ID needed for Window Sash Spring

A home owner from Jacksonville, FL says:
Soon to be repeat customer needing help IDing replacement part window sash spring shown in attached photo.
User submitted photo of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. I recommend either our Series 380 or Series 385 balance, depending on the size of your shoe. That is the only difference. Look them over and see if you agree.
A quick learner says:
Ordered the 385 with 2940 option Thanks for your help.
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