What makes the Chrysler upper control arm functionally and assembly-wise different from Chevrolet upper control arms? Just curious.
As I recall, unless something has changed, upper control arm bushings should be available, maybe not from the eBay vendors you are shopping, but should be around. Which is why my FIRST shopping place is
www.rockauto.com. Usually lots of different vendors and pricing to consider and look at.
As I recall, most of the available upper control arm bushings are designed with an "offset" in them to allow for things like "use changes" in the suspension support items. I first heard about that on GM intermediate cars, going all the way back to '55 Chevy cars and especially in the later 1960s 396-454 cars. Just as an advisory. Might also be used to gain a bit more caster? Not sure.
Chrysler might list a "special tool" in the FSM, but I somewhat doubt any still exist in the world. Which means a more universal item is needed. Maybe even for rental at some chain auto supply stores? Seems like I have known people to use a torch to burn the rubber and then deform the outer bushing shell for removal? Then installing the new bushing. "Shadetree method".
Keep us posted on your progress,
CBODY67