There is a nylon or plastic bushing on mine, should I grease this or run it dry? What grease should I use if I need to?

I did ...right or wrong I could`t tell you..but I lightly grease all moving parts...take that arm apart and see how the rubber bushing is mine looked OK until I removed it I made new ones from nylon dowel,,good luck
MikeC

Powdered graphite is ok.

The wrong grease will disolve the nylon bushings. Should not need lube but Pelican does carry the correct lube.

Weltmeister sold special Lube for there swaybar. That's what I used over the years. Keeps it from squeaking.