Download 2008 Cadillac DTS Upper Class Series Mesh Grille Installation Read and understand instructions before attempting installation Step 1 Locate your new grille. Make sure that all the hardware listed above is present. Place the new grille into the bumper opening. From the backside of the bumper; place an L bracket and nylon lock nut on each. Make sure that the L brackets wrap onto the factory bumper plastic. Make sure that the grille is centered and tighten all the hardware.