Ok - what am I missing here?

The standard bolt pattern on the 1973 240Z is 4 - 4.5 (114.3mm) - but the rotors in all the places I've looked show a bolt circle of 4 - 103mm.

Do they measure the pattern differently on a rotor than they do on a wheel?

I do not want to order rotors and have them not fit.

Any info would be appreciated!

Z rotors bolt to the back of the hub, they don't slide over the lug studs. The patterns are different.

That's the correct disc. The wheel pitch circle diameter is 114.3mm. The hub pitch circle diameter is 103mm

Thanks guys!

Kinda figured I was missing something.

I installed the new su's from Ztherapy (worked great btw)....so now I can go fast....I just need to work on the brakes so I can stop....it's always something!

Thanks again.