I am not sure which is the correct channel replacement for a Milgard non-tilt window. I believe I need the
Paul from SWISCO responded:
December 6, 2016
Start by looking at our S385-27 channel balance. This comes with the 19-005 top and 15-004 bottom attachments, so as long as those match up you should be okay. I would also recommend the 2660 spring strength option, based on your original stamp.