1) Those are the correct part numbers for '96-'97 993 turbo front calipers. 2) Many have given up on Sierra "Vaporware" Motorsports as it pertains to rotor hats. That being said, Bira System S6x hats will place the 993tt rotor under the 993 caliper when using an unmodified RS2 caliper carrier bracket. Frank at s-cars.org