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NON-TILT WINDOW CHANNEL BALANCE option code ?

A quick learner from california says:
i THINK i have idendified channel balance but want to confirm (strength) option code

details

NON-TILT WINDOW CHANNEL BALANCE

1) 1/2 inch channel width

2) series 385
a) 19-005 top shoe
b) 15-004 bottom shoe (1 - 3/32 inch )

3) lengtht 27 inches = S385-27

4) stamp / option ??? GUESS is 2640

Marking 26 4 B.S.I. ND

thanks !
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hello! I agree with your assessment. Our S385-27 with a 2640 option looks like a great match.
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