Jimmy, here's a pic of the Brembo (Viper - Gen 3 and 4) mechanical parking brake. I've seen them brand new for around $280 each. If you try to buy them through a Lamborghini or Ferrari dealer, they want more than that for just the pads!!! The Tesla EPB is very similar but it has an electric motor on the inner side instead of a piston and mechanical actuators.
Doug, the Tesla EPB will accommodate a rotor up to 1-1/8" thick. Above that, you either have to file the pads down or make a spacer to go between the two halves of the caliper. Jon's adapter bracket fits the OE rear rotor diameter. Above that, you'd either have to modify Jon's brackets or make your own.