Looking for a lost '73 BB trans

I just bought a 1973 Stage 1 Century, but it has the wrong transmission (AA code), I've been told the correct matching numbers trans was last seen in the Independence, MO area. It should be a BB code with the number 106639 on the tag. Can anyone help me? Thanks, Pat

 

Try to PM Rob Ross I think he has a 73 all complete BB.

 

Central PA traders guide this weeks ad
1973 Buick GS 455 4 barrell, auto, posi rear, drivetrain only, $900
phone 814-254-1383

 

Mine is a 74...see attached.

 

I might have one of these...I will check later this morning for you.
Doug