Mike,
If you got the strange 5/8" studs, they look like long bolts that thread in from the inside of the axle flange and you will need the threaded sleeve that goes with them. The strange set up is different than mark williams set up. MW has a stud that is threaded on each end with a shoulder (11/16 to match the hole in the wheel.
If your studs look like a bolt that is threaded all the way, check on stanges web site for the sleeves. The sleeves make up the diffence in the 5/8" stud and the 11/16" hole in the wheels.

Brian Dunnigan