I installed the v8 poly mounts in my 6cyl mounts. Think i am the only one who has ever done it and documented it. Almost no more vibrations than stock. Then I also yanked out my 42re and installed a nv3550
Much more responsive to the throttle instead of having power going into movement of the motor. The difference is that the poly inserts are twice as much material than the brown dog mounts or the universal poly mounts that you make yourself.
1993 ZJ Clayton long arms with Johnny joints, custom front axle W yota center, D44 chevy outers, fabtech dirtlogic 2.25, front bilsten rear shocks, tacoma rear axle, 4.88, arb rear, 5 speed, poly motor mount inserts, NP241OR 4-1 ,receiver front for xcr 8k winch