So I found out that the problem was bolt pattern my gmc is 5x125 or 5x5 and turns out the IROCs are 5x5.5 Sorry for the late responses I’ve been busy with work and such but I’ve ordered a new set of wheels that will be custom made to my bolt pattern specifically the only other problem I run...
I Tried to mount the wheels and it’s almost like they won’t slide back enough due to the cap. And I’m not sure what to do with the cap so I came here I can try to remove it and see if that makes a difference