I have rear bushing questions!

Rear
I installed aftermarket shackles on the rear of my Trooper. However, they came with 3/8" bolts and 3/8" bolt holes, and the rubber bushings in the Trooper leaf springs have 1/2" holes in them. Is there a bushing kit made that fits the Trooper springs and the standard 3/8" shackle bolts.. perhaps one with the hardened metal sleeve?

Any suggestions are appreciated!