67 is 3 pieces, a narrow 1"+ trim piece top and bottom edge and a wider 4" or so panel in the center with "Barracuda" script on the right side and the pentastar emblem on the left.
68 is 2 pieces, 3-4" wide, 1 each top and bottom with "Barracuda" script and fish emblem attached to the "blank" center section of the lid.
69 is one single wide piece that covers the entire back of the lid.
None are interchangeable without drilling trim holes and in some cases filling exposed trim holes.
All 3 years have different taillights as well. Although they will physically fit in the 1/4 panel they will not line up with the trunk trim for a different year.