Anyone know the exact measurements of a set of wheel spacers for the z?

would any of these fit (i know i need one with 5 lugs...i'm not that brain dead...haha).

http://www.gmpperformance.com/produc...es/spacers.htm

someone give me a web site that has a good description.

i am going to make these myself (i have the machines to make them)...i just need the specs.

thanks,
djk