Ah I see I took a good look at it and searched through a couple magazines and I think I figured it out. There is one piece of metal shaped like this \_/ under the 'rad support' with two bolts that go thought it. You can see two of the pieces in Robins pictures. The 3100 has one in the center. Chevy Duty sells a rubber pad that goes beneath the \_/ piece of metal. As far as I know thats it Just the two bolts in the center bottom of the support. -Roger