It may or may not be the insulator. I've had good luck loosening the exhaust clamps, raising the exhaust high enough to get a 1/2"-3/4" wood block between the trans cross member and the exhaust pipe and retightening the clamps. The exhaust sometimes settles a little during normal driving/bouncing around and irregardless of the tranny mount hanger, it does settle some.
The rear hanger near the differential/axle doesn't have to be Jeep specific, more than a few universal types will work (I have a junkyard Ford type in my 96).
Check your gas tank clearance and the health of the rear most hanger, this hanger tends to rot.
To get a little more lift and clearance you can even loosen the collector connection (doughnut) and get a little more play.
Exhaust systems, especially after market, aren't all exactly the same and they may need a little tweaking.
I've even needed to bend that hanger rod a little with a pipe wrench.

Banging your exhaust on rocks or whatever bends stuff.