Help with engine mount
 

I have a 2005 Mini - Cooper S. I noticed that the engine mount has leaked a puddle of black stuff. I ordered a new mount and they sent me the incorrect part. The part that was sent is just a black hard rubber boot. The one that is on the car is the same thing but it is enclosed in a metal housing. there is also an arm that attaches to the body of the car. I can send the old one back and get the correct piece. The problem is that I do not understand how the broken part comes out of the car and how do I install the new one? The manual does not cover this procedure. Please help me out here.

Aaron Wiener