Finally getting to it!!! 1970 Duster 340

Benefits ? Better design from Chrysler. Probably just more stout, with more rubber.The bushing I showed you, are actually the correct style bushing for your 70. The bushings you have in your pic are for an early A. My money says you got them in a rebuild kit ?

The end washers have some history to them as well. Originally Chrysler installed them cupped out, opposite of what you would think they go. The washer actually says "this side to rubber". Then Chrysler engineers (not sure what year) decided to flip the washers the other way, eventually adding a cotter pin as well. Having said all that, there seems to be a huge debate on this issue.

On my 65, I have the washers cupped out.
On my 70 I have them cupped in.