Milgard balances

A quick learner from Las Vegas Nevada says:
Milgard Sash Balance replacement.
number on part 26 4 BX CMC 11
Metal part is 27 inches long
1/2 inch across
order for 2
how long will it take once ordered.
I live in Las Vegas
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Bob from SWISCO responded:

See our S380-27 or S385-27. The only difference between these two balances is the depth of the bottom nylon shoe, or the heel-to-toe measurement, so compare both with your old hardware to see what matches best. You will need a stamp option of 2640. 

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