PUT 6 LUG CHEVY/TOYOTA WHEELS ON TJ YJ SJ XJ. 6x5.5" (6x139.7 MM). 5x4.5" (5x114.3 MM). You need two sets of lug nuts for these adapters to work. One set of open end lug nuts to bolt the inner piece of the adapters to the vehicle and one set of appropriate lug nuts to bolt your wheels to the studs of the adapters.
If the lug studs do their job it will be a complete success. It took me half a day to run down the special lug nuts needed for socket clearance of inner adapter lug hole walls.