Sash balance

A quick learner from New Jersey says:
I just wanna make sure I order the right part I need the left and the right and replacing both. I can't really figure out what the numbers are to order the right part.
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Bob from SWISCO responded:

Without clearer pictures of the stamps, I'm afraid I in fact can't say with total confident what the right part is. That said, I think it reads '1131' on the bottom tab. If so, then you need our 24-1133 , which can replace old Andersen balances that have this stamp. Just be absolutely sure that's actually what it says. 

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