[mattybilt79]

The later style center caps are held on by the plastic "lug nuts" that thread on to the steel lug nuts. Its just a cover. Your truck being an 89 all you need are the caps and lug nuts and put them on. To run the spikes I'm sure you have to modify some part of the cap to make it work. But if you like they way it looks go for it. I pulled Alcoa's and chrome wheels off my dually for flat black steelies and used lugs that were on the truck, big 1 1/16 motorhome acorn lug nuts.

The simulators should have small foam blocks on the back side to keep them from rattling usually long gone after all these years.