The fronts were a bit tricky to install. From the old standard rotors, the off set piece has to be reused and bolted on the new rotors so don't throw away your old rotors before you install the new ones! Whereas the rear solid slotted rotors were a direct fit.
So when buying the rotors, what information that the shop would need are the diameter of the brake rotors you require, its PCD, the thickness of the brake rotors and the thickness of the off set piece. The more information the better.
The top ventilated slotted brake rotors are the fronts and the bottom solid slotted rotors are the rears.