Back in those days Oliver had a pretty simple parts system. 705 was the part number for the wheel. The first letter identified which tractor the part was first used on B being the letter for a 70 and in particular a rowcrop 70. As parts were improved a second letter was added. In other words BA meant it was improved from the first design. Since BC is later than BA it superceeded the BA part number. Does that help to start with?
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