Balance for single hung aluminum frame window

A professional from Lake Forest, CA 92630 says:
# stamped on old part 2730 We need a quantity of #6

User submitted photos of a window balance.
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Paul from SWISCO responded:
It's hard to tell exactly what this is, but start with our S350-28 and see if that's a good match. Just make sure the nylon ends are the same size and style.
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