I have a couple interesting sets of tailight bezels, maybe from a 300 series? The 67 set looks exatly like the ones on my wifes 67, but there are no cross bars over the lense. The 68 set looks exactly like the set on my two 68s, but the top inside corner is rounded, like there was no trim piece across the top of the rear panel vbelow the trunk. I've never seen sets like these, even in catalogs. Any ideas?

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The mouldings under the trunk lid were not used on the cheaper models like the 300 Deluxe, The tail light bezels were different. That must be what you have. They should have the reverse light in them. Not like the Malibu/SS/Concours that has them in the bumper.