Help, I need a window balance fast

A quick learner from window hardware says:
June 21, 2014
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:
June 24, 2014
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.
31" Series 371 Channel Balance
31" Series 371 Channel Balance
S371-31
$11.52
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