The Iroc wheels were taken off of a 87 S10 my neighbor had, he put hoosier slicks on with a v8 swap. I had to custom fit them, but I have always loved the looks of the iroc wheels, especially these ones. The tires themselves are ones I had on previously which fit on the rims. I will be going to a lower profile tire soon as I plan on dropping it an inch or so :-) And I read someone else talking about w-body so I have registered there as well. However there forums are really sloppy, but they do seem to have technical information.
:-)