Tom from SWISCO responded:
October 8, 2015
Start by looking at our Series 380 channel balance. I think this may work for you. The nylon attachments look slightly different, but cosmetic differences shouldn't matter so much in this case. They're similar enough to not worry about that. What's more important is that their dimensions are the same, so make sure to confirm your measurements against ours.
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Tom from SWISCO responded:
October 13, 2015
Yes! A stamp of 28C usually corresponds to our 2830 option. You can always weigh your sash to confirm, though.
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