67 vs 68 Trim Differences

^^ what Red said^^ while it might be 1k in parts to change. you still have parts worth money to recoup some of that back.

67 header panel sans letters is the same as 68. The 68 said Plymouth in a script on the left side.

grilles are different mostly the center insert, vertical lines instead of a "boxed" type design. the surrounds are nearly the same with 3 vertical supports for 67 and 2 for 68. headlight bezels 68 had an extra screw on the outer lip.
The 68 trunk trim was wide top and bottom trim while the 67 had top and bottom thinner moldings and a center molding.
tail lights as noted, no one added the external back up lights so nothing to change there. In 68 they were part of the tail light assy.