Help, I need a window balance fast

A quick learner from window hardware says:
I'm selling my house and settle on 30 June; however my window balances broke and I need 4 of them really fast. I'm willing to pay for express mail. I think I need 31" Series 371 Channel Balance Product Code: S371-31, using your on-line page, but I don't know the stamp option to choose. I attached some photos of it. Please tell me if I chose the right product. If so, please contact me immediately for express mail option. Thanks Darrell Kim,
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Looks like your balance is stamped with 30 C. This usually corresponds to our 3030 option, but you may want to weigh your window sash just to be sure.
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