Question about tail light lenses

Um, what are you asking? Of course a 68 lens will fit a 68 bezel, so I assume you meant something else. But I think the answer is "no" -- 67, 68 and 69 all have different bezels and different shaped lenses, and the 68 is wired different, as well. You could just bolt on a whole 67 taillight assembly, but you have to do something to swap the wires around, since the 67 has tail, turn and brake lamps, but not reverse lamps. 69 assembly would fit just as well as a 67, but would probably look bad (not remotely lining up to the trim), and it's rarer, anyway.