8 3/4 axles 8.75 left and right differences

I recently bought a 8 3/4 rear end from a challenger that had been rolled at a junk yard and some one took out the center section and one of the axles were gone. i think the one i have is the left one because it does not have the adjuster on it. i also got another axle from some one but it looks like another left one since it does not have the adjuster either. I was wondering is it possible to get a adjuster and put it on one of the axles or do i need to get a different axle that already has the lock plate on it.

Also is there a place to get the lock metal peice that holds the adjuster in place that adjusts the end play.