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The existence of a unique 'leg' for fours and another for V8s suggests that would be reflected in unique part numbers for them, namely one with a 'B' prefix and another with a '18' prefix. I believe that I have all three of the original U.S. '32 chassis parts catalogs that were published during 1932 as well as copies of the original engineering drawings for the frames and the corresponding engineering releases and all show all the parts of a passenger car/commercial vehicle chassis frame have only 'B' prefix part numbers.
Perhaps the confusion has arisen with the changes that occurred to the 'legs' (B-5048 and B-5049 frame center cross member braces) over the course of '32 model production. If you removed a complete center cross member from a B chassis and another from a V8 chassis that was manufactured at a different point of time and they were different from one another, that might lead you to conclude that there was a difference between B and V8 B-5048 frame center cross member braces. In the photos below, note the variations in those braces, most notably in the shape of the various holes and in the extremely rare version with the integral brake/clutch pedal bracket (the right side of which is bent out of shape).