S350-29 : 29" Series 350 Channel Balance

A home owner from Jacksonville says:
While I think the S350-29 will match channel balance I'm trying to replace, I have a quick question.

On the current balance, the number is 28 5 which I think will match up to the 2850, however it also has "BSI" stamped fairly close. What does the BSI mean and does it affect what I need to order?
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Tom from SWISCO responded:
The "BSI" stamp just lets you know who originally manufactured that part. It has no bearing on how the balance functions and is not used to identify a match, so I wouldn't worry about it.
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