Although both guys probably have quite a few guitars, I associate them them with these guitars...
Greg: Gibson Hummingbird acoustic and some type of sunburst Gibson hollow body electric maybe ES-335
Jim: Gibson J45 acoustic (probably some vintage model) and Fender Telecaster for an electric. I also see Jim with what looks like some type of Gretsch solid body electric (possibly a Duo Jet, but the big "G" probably indicates a higher model than that) and a red Gibson hollow body (possibly an ES-335). I think I've also seen him play what looked like a Martin acoustic, possibly a D-18.
People that are closer to them can probably tell you, "That one's a 1968 Gibson ....."