I didn't keep the instructions, but they're easy to install. The front uses two screws that are placed at the bottom outer edge. The rest are push in plugs. The back has one screw at the bottom inner corner. The remaining holes are for push in plugs. Where did you get the flaps? They should be able to print out install instructions for you.

__________________
E70 X5 3.0si Space Grey

E36 Z3 2.5i Roadster, Sterling Gray Metallic