Confirm Channel Selection

A distributor from Lexingtom, KY says:
The pictures I hope shows a S390-16. The metal piece is 16". My confusion is due to the 1620 stamped on the piece. Is S390-16 the right channel balance? Thanks
User submitted photo of their window balance.
Profile picture of Tom
Tom from SWISCO responded:
It certainly looks similar to our Series 390, yes, but the only way to confirm is to compare the measurements of your nylon attachments to the dimensions we show for this hardware. It's hard to eyeball that kind of thing, since those measurements can get pretty specific.
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