Well, after some additional exhaustive research, I hope I'm a bit closer to solving this.

To recap, Gen1 FSM calls for 2 tools to change bushings on the rear trailing arms: MB991293 Arbor(n/a) MB990891 Bushing tool($95-125)

Additionally if you want to change your panhard bar bushings, you'll need: MB990650 ($?)

I was able to locate a tool lot on 'bay that had both MB990891 and MB990650 in it. But the Arbor tool MB991293 remains elusive.

My thought was perhaps in later FSM's it was replaced by another Arbor tool, but after downloading the 1992 FSM from Mitsubishilinks, it showed the same tools to be used for early Gen2.

Now the tool lot I bought on 'Bay has a few different Arbor's included. I've got my fingers crossed that one of them will satisfactorily take the place of MB991293.

I'll keep everyone updated on my progress.

Damn this is getting expensive (and time consuming!)

Jim