[71 super]

The easiest method that I found is to take a water based marker vis a vie or similar and first mark the location of the retainers for clips on the trim pieces. Lay the pieces in position and make a small mark on the bed, centering the two marks you made on the trim. Remove the trim and center the the mark in the tailight area and drill approx. 4 5/16 holes and the appropriate sized holes for the two retaining screws located on the inboard side of the trim. Install your clips and press into place. I used this method on my 4x4's new sides and had 0 problems. take your time and measure twice. I did mine with a three year old helping and it turned out great. Hope this helps- oh be sure to limit the depth of the drill bit as you drill, if you go too far you could puncture the bedside.