If you are referring to the tranny skid, not the front skid, I believe the part number is 52128925AC.
You're probably better off ordering it from a local dealer, to save on shipping. I paid about $30 for mine out the door (including tax).
Here's a pic of my install:
Notice how the front gets sandwiched between the front skid and the frame (using only one bolt), and the back attaches directly to the crossmember. You'll need to get a couple of nutzerts from the dealer, if you want to use them, or just drill all the way through the crossmember like I did.
These pics sort of show where to drill the new hole in the rear of the skid:
