you will want to check the backspacing to see if you will want to run wheel spacers, but if your running 20's id imagine your mostly on the road and the spacers will not be absolutely necessary, but help the stance/handling.
I'm running the Enkei's that came off the 05-06 Tundra Sport Package. To make these fit I had to get the 1.5" Spacers. Although the Enkei's center bore was 108mm, the bore tapered smaller to fit the center cap, so I had to dremel out a cavity for the 6 bolts that hold the hub on the rears, since they stood out a 1/4" farther then the spacers. The fronts were fine since the axle didn't protrude past the spacer. I didn't want to go to 2" spacers because I was worried about the stress on the axles and oem lug bolts and didn't want any tire to fall off accidentally ;-(
The 1.5" spacers allowed these rims to be about <1/4" out than flush of the fender flares.
So make sure that the center bore of the rim is 108mm throughout the rim.