Channel Balance Part

A home owner from San Diego says:
Length is 28 inches
Width is 1/2 inches
Weight of window is 16.8 pounds
Narrowed it down to 350, 380, 385 but cannot tell which one of the 3
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Bob from SWISCO responded:

Thanks for posting. This looks like an S385-28. Just double check the depth of the bottom nylon shoe to be sure. Based on your stamp of 27 3 as well as the weight of your window sash that you've helpfully provided, you should select a stamp option of 2730. Many thanks!  

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