Geez guys they are just wheel discs, rear might even be a timing disc, they should weigh about 3 lbs or less per wheel.
A piece of billet to make a front one would cost at least 400.00, then you have to machine it.

------------------------------------------------------------------------
Serious, if you think it looks cool (I dont), look up the real thing..
Joe Petrali Knuckehead Racer.. now THAT is cool..