I did a search and I cant seem to find all the information. I am trying to see what size rotors came on what year and the differents in calipers. can some one help me out???

 

forget it, I found it. Since its up I'll post the info:

G35/350Z 03-04 296mm X 24mm (04-05 X's)
G35/350Z 05-06 320mm X 28mm (06 X's)

Brembo all 324mm X 30mm

Now just some caliper info would be great

 

05+ Sedan and Coupe, '06 Sedan X
Front: 12.6-inch X 1.1-inch power-assisted vented disc - 2 pistons
Rear: 12.1-inch X .63-inch power-assisted vented disc - 1 piston

'03 and '04 Sedan, '04 and '05 Sedan X
Front: 11.7-inch X 0.9-inch power-assisted vented disc - 1 piston
Rear: 11.5-inch X 0.6-inch power-assisted vented disc - 1 piston

'03 and '04 Non-Brembo Coupes
Front: 11.65-inch x 0.94-inch power-assisted vented disc - 1 piston
Rear: 11.5-inch x 0.63-inch power-assisted vented disc - 1 piston

'03 and '04 Coupe Brembos
Brembo® brakes
Front: 12.76-inch x 1.18-inch power-assisted - 4 pistons
Rear: 12.68-inch x 0.87-inch power-assisted - 2 pistons

 

and will all the 06 parts bolt right up to the 03 spindles?

 

Yes.