This may be obvious, but I ordered a set of front and rear rotors from R1 concepts; how do I tell which are the front and which are the back? I know which rotors are pairs (because of the part numbers) but I don't know how to determine the front from the back.

Also, What direction should the rotors be pointed on the car?

Like this: http://www.bmw-sg.com/features/leube...-uber-z4-4.JPG (what I would consider backwards)

Or the opposite way?