5#23 andersen balance

A quick learner from Minnesota says:
Best attempt to read part numbers for anderson double hung sash balance - it looks just like sash balance 24-1033
Markings appear to be
135 5#23 4-87
Please advise proper replacement part #
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Paul from SWISCO responded:
I recommend our 24-531. This can replace Andersen sash balances with a stamp of 5#23.
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