Does anyone know if Akibono BBK will fit under my stock 18" rims on my 07
G35S Sedan? Will I need a spacer? Talked to seller he said sometimes the BBK fits sometimes it does not!

 

you will need spacers or get G37 wheels and you won't have problem.

 

how much bigger are the rotors on the Akimbo kit than the stock G35S rotors??

 

Here you go. I say you probably won't be able to fit it without (a) a wide enough spacer and (b) relocating the wheel weights.

http://gshack.org/?p=118

G35S Rotors:
F: 12.99" x 1.26"
R: 12.99" x 0.630"

Akebono:
F: 13.98" x 1.26"
R: 13.78" x 0.787"

 

will 15mm spacers do or how can I figure it out? and do I need front and rear spacers? Fronts 225/18 Rear 245/18

 

Where do I need to move the weights (probably a stupid question)?

 

My OEM's are in storage so i can't measure it for you. The images i posted on my site should give you an idea of spacers and wheel weight placement. If you need further insight, i suggest downloading Coz's template (CZP on the marketplace).