Changing dually wheels from one truck to another.

[rs74]

I am thinking about taking the Eagle 058's of my 85 and putting on my 84 C&C. What I am wondering is that the 85 has two inch spacers between the rims on the back of it and it looks like the studs from the rearend look fairly new. Would there be a possiblility that the 85 has longer studs due to the aftermarket wheels? I might have to just take a set of wheels of one side on both trucks and compare. My C&C just has factory steel rims with simulators on it.