300zx front brake swap question/issue

[pepe123]

ok heres the set up

s13 knuckles
s14 5 lug hubs
30mm 300zx calipers
300zx rotors 30 mm

for some reason i looks like i need a spacers where the caliper mounts to the knuckles, as if the knuckles to far back. if i mount the calipers like this the pull the rotor toward the mounting points, and lock up the rotor so it wont spin. im thinkk i could just run some spacers and it would work but idk why im having this issue