The only issues you'll have fitting a Kifaru, or older Mystery Ranch bags are buckles.
I'm getting a Guide Light MT frame shortly, my wife already has one with a Terraframe 50. First thing I'll be doing is changing buckles... I have a Crewcab, 22 Mag, AG1, Decker Pocket and a few other bags that will fit once buckles are replaced with field repair buckles, etc.