Searching for 356 4#19

A quick learner says:
Hi.
One of my sash balancer's is broken.
the engraving is
Anderson
356 4#19 12-80 (I presume manuf December 1980)
11600-2

What replacement part # do I need?
Profile picture of Michael
Michael from SWISCO responded:

Take a look at our 24-431, this should work as a replacement option for you.

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