Window Channel Balance assistance

A home owner from Los Angeles says:
September 22, 2017
I'm trying to get channel balancers for my windows that are without after purchasing home.

The 4 windows are as follows;

approx. 5lb
Sash length - 20 inch on 2, and 21 inch on the other 2

I've attached a picture of balancer 2210A that works with the 21" sash, but don't see that model on the website?

For the other 2 windows, that 2210A doesn't work (need something a little smaller in length and not sure which model that is)

Thanks for any help!
User submitted photos of a window balance.
Profile picture of Casey
Casey from SWISCO responded:
September 27, 2017
Thanks for your detailed information. Since the numbers stamped on your channel balances do not identify which balance you need, I am going to have you take a look at both our Series 351 and Series 390 channel balances. Depending on the measurements of your bottom, nylon balance shoe will determine which of these you will use as a replacement. If you should need any more help, please let us know.
17" Series 710 Channel Balance
17" Series 710 Channel Balance
S710-17
$10.23
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