BSI 27C replacement balance

A handy person from St Louis, MO says:
June 22, 2011
I am looking for replacement balances for these labeled 27 C bsi.

I hope the pics help.
User submitted photo of their 27 C bsi channel balance.
Profile picture of Paul
Paul from SWISCO responded:
June 23, 2011
The top is missing on the balance but I believe you have the S380-28 with the option 2730. Take a look at another window in your house of the same make and model. See if the balance has the top still and compare it to the 19-005 (the top used on the S380 channel balance).
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