Getting the right Window Balance

A home owner from Florida says:
October 12, 2016
Hi. Trying to make sure I order the proper window channel balance. I've attached pictures that will hopefully help. It looks like I have two different numbers depending on the window. The one I sent pics of appear to have a "28B" number on them. The other one that is not pictured, looks the same, but has a "28D" on it. Could you please help?
Balance
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Tom from SWISCO responded:
October 14, 2016
Please see our S380-29 channel balance, I think this is what you need. I would also recommend weighing your sash on a scale, just to be 100% sure which stamp option would be the best choice.
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
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