Channel Balance parts

A landlord from Mount Vernon WA says:
I'm trying to figure out what replacement channel balances to order for some aluminum, single hung windows. This website has been great walking me through the different options. I believe what I have is a 16" Series 385 (althought the shoe doesn't look exactly the same, but size-wise is exactly right). What I got held up on is the stamp option for the sash weight. I have some different stamps on some of these broken balances that all came from the same building. Do you know which weight I should use? Is there a better weight we should be using. There are a good number of these windows missing the balances because they no longer work. Thanks
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I agree, your hardware appears to resemble our Series 385 channel balance. However, I am not sure exactly what option you should use. Your best bet is to weigh the sashes for each balance and reference the option chart found on the S385-16 page to determine the best one to use.
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