window sash balance rod weight 2965

A quick learner from Denver Co says:
I need to replace a balance rod, it looks to be your 390 series 30" the number stamped on the rod is 2964. Your options are 2960 or 2965 Should I get the 2965?
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Casey from SWISCO responded:

Hello,

We'd be happy to recommend a replacement balance for you but since your stamp seems to be unique, I'd like to see a picture of an undamaged balance removed from the window and the stamp itself to make sure you purchase the correct balance. Thank you!

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