Short time lurker, first time poster. Bought a 2009 G37X sedan (81K miles) just before the holidays, and am replacing the rear pads and rotors WITHOUT the big brakes. Ordered a pad and rotor 'kit' from RockAuto with Centric CE120.42093 rotors - when compared to the rotors on the car, they're slightly larger around. Measured, they are 330MM - can anyone confirm that what I do need is the 308MM rotor?

The kit had the rotors (CE 120.42093) and pads (CE 105.09051), but the pads seems too small for the rotors they sent in the kit, so assume that the pads are the correct size for the 308MM rotor.

Thanks in advance for your help.

 

Yep, those are the rear AWD/RWD coupe rotors (330mm), you'll need CENTRIC #12042088 (307mm). FWIW the AWD sedan uses all the same brake parts as the non-sport RWD sedan. 322mm front /307mm rear rotors.

The rear pads work for the 330mm & 307 mm rotors so you're good there.

 

Thanks very much for the info. Very useful for someone starting with no base knowledge on the G cars.