All of the high end calipers are radial mount. Take a look at any Porsche or Ferrari and you'll see radial mount Brembo calipers. The Corvette was the only super fast car that was bucking the trend but I think GM engineers finally saw the light on the track cars.

Center to center on the Viper caliper is 130 mm. That is a fairly common measurement but I wouldn't bet that all Brembo calipers use the same dimension.