Putting on the 3000GT VR-4 calipers is not worth it. It takes a lot of time and effort compared to the GSX calipers or aftermarket x-piston calipers. Here is a statement from the DSM VFAQ:

"To graft the VR-4 TT brakes to the DSMs, the spindle from the TT has to be modified by a machine shop so as to utilize the stock T/E/L front shaft bearings and hubs, and the stock Brembo calipers must be ground to fit 17" wheels, since the caliper sides will rub against the wheel spokes."

Make it easy for yourself and either get the GSX or buy a kit from an aftermarket company.