Jimmy,
I wouldn't be surprised if the mount spacing is the same for both the Viper and Tesla parking brake calipers but I have no way of knowing for sure. The photo of the car with the Brembo mechanical parking brake isn't my Pantera. In fact, I don't think it's even a Pantera!
The reason I like the Brembo mechanical parking brake calipers is, they allow for the best cable routing. My first experiment with aftermarket parking brake calipers was a StopTech / Audi S4 unit. They worked great but I wasn't crazy about the cable routing. Notice the outboard mounted brake hat/rotor.