I made one for my old axles I had this problem with (long ago). It's the part with yellow paint on it.
What I did was have a machine shop make me a circle the size of the companion flange mating surface, with the 6 holes drilled in it to go between the axles cage, where it bolts to the companion flange. It fits between the companion flange and the cage where you bolt the two together. I only had to do the passenger side for some reason.