Those aftermarket A body axles are made for use w a BBP 10 or 11" drum/backing plate unless they were special ordered for the stock SBP 1&3/4" shoes & corresponding 1&3/4" drums(& drums then redrilled to BBP) and a smaller flange. I would pickup a set of common BBP 10" drums/backing plates.

live every 24 hour block of time like it's your last day on earth