I bought both the Eleanor and the Shelby style, and gave up on both! My friend a body shop says you have to take filler, to fill in the gap. Placing almost cured filler onto the area where you're placing the piece, (tape would be placed on the body so the filler won't stick to the metal), then the filler would fill in the gaps. the covers that I bought were just too "off", no way. Mine had bolts and would be fastened by them, and eventually by the bonding of fillers. however, holes had to be drilled to even see if the pieces would fit. I welded the holes shut and went with stock false vents. If you go with the stock vents, I found that they really need to be off the car to paint adequately. They're very difficult to paint, I think that's why I liked the '68's much better, but alas, I'm stuck with my '67.