new Zr1s wrong lug nuts?

i got a set of Black Zr1's from Tom Z wheels. it they came with new chrome lugnuts. the lugnuts tightens for a couple of threads and then it stops completely on the side of the lugnuts it says 12X1.5. i called tom z wheels and they said that that's what it says that goes on my car. it is a 94Z. what would i need to do would i need a different type of thread design or should they fit?

they should fit...unless someone put different wheel studs on teh car.

take the old nuts that fit to a shop and have them check the thread with a thread-guage.

maybe get a thead die and chase the threads on the studs, could be some fugged up threads