Your chances are slim & none,….and slim don’t look to good,….fortunately, this is a pretty common set up across the manufacturers…..an arm from a MTH or even a Lionel GP7/9 will work as long as you get the matching armature plate …the only thing that holds this all together is a T bar, spring & e clip,….you van use postwar Lionel reproduction parts to get you back running again,..
Pat