BSI with a little D before

A quick learner from Port Saint Lucie, FL says:
March 1, 2017
Hello,
After reviewing the stamp and dimensions on my 2940 channel balance 30" and it looks like a match to your 30"series 385.

However, I was wondering if I need to factor something else in if mine has a D BSI stamp as well.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
March 7, 2017
I agree, the Series 385 looks like a good choice. Just make sure the nylon ends are the same size. Don't worry about the "D" or the "BSI." All that matters is the "2940."
30" Series 385 Channel Balance
30" Series 385 Channel Balance
S385-30
$11.30
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