Have a 55 olds, have a freind that has a fuel pump off a 59 olds with glass bowl, looks exactly like mine but the nimbers are not the same will this work on my 55??
Frank Allen

 

Looking at Fusick's catalog, 57-58 appears to be by itself - including the rubber line from the frame to the pump...may be as simple as a different fitting size or similar, but I would make sure that the arms are exactly the same length and shape otherwise you could damage the fuel pump eccentric in the engine.

If it were me, as long as I was confident about the lever arm being the same, I'd give it a shot.