Wonderful points all, thanks. When you say that the housings are different, but the third members will fit all....does this mean that there is a difference in maybe width and maybe spring shackle width....housings are different. I think, think , that my 66 has the adjustment on axle lash.....only from the tube views....have not gotten to the car yet on that. But, with the center button between the axles, I think that it may have lasted a bit longer, but not sure yet. I am amazed that chrysler used this lash for the bearings....outboard outside the seals....amazing. The new green bearing goes more modern, with a ball bearing, that will take thrust, and does not depend on the lash and clearance from for a simple single bearing outboard, instead of dual tapered bearings as on front wheels. Yes, may not take the same load as a tapered roller, but pretty good for most purposes. Finally, where in heck did you get the numbers for the yokes.....I have never seen them....Ujoint size.....no numbers, just measure them.....aaargh.