Thanks guys.
So were there two washer bag bracket sizes?
From my notes, the same bag bracket (B9BA-17651-A) was used for 1964 and 65, it changed in 1966 (C6OB-177651-A). The difference I believe, is the 64-65 has two mounting holes, the 66 has a third in the between the two, function possibly for welding, or alignment.
Jim