Z31 Calipers on an S13

[drifts14x]

Hey, I read about how the Z31 Brake rotors are similar to our brake rotors stock, but I was wondering about the Calipers, are they the same, or are they bigger than the single-piston calipers than we have in the rears of our cars, I have a 300Z near me that is like nearly mint and I keep looking at the calipers and I swear that they are bigger than ours. If I could fit these without major modification, please tell me, because these calipers are looking really nice. Thanks in advance.