Nooooo you don't go into a dealer in the days an ask for an R34 GTR. You would just say Skyline GTR. R32, R33 etc is the model code like Z33 and Z34 or DC2, DC5, E46, e92..... Those always remain in the background as the manufacturers build code - it's different to the name of the car. 911 can be 964, 993 996 and so on as their build codes.