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I'm sure that removing the dedicated back-up lamps after 1968 was nothing but a "cost savings" venture for GM. I had a '68 (years ago); and the amount of light when backing-up was considerably better than in later years.
I read somewhere, from a GM executive, that they would throw them a ton of money to launch a new vehicle, but then they had to cheapen the vehicle every year to satisfy the upper management. From 1968-up, only 69-82 Vettes have only two tail lights and I feel that this is a safety hazard! Glad I have a 68. Lou.
Backup lights started in 1963 as option T86. In 1965, the options appears to have disappeared but I think it merged into the Z01 Comfort and Convenience Group. Then in 1966, backup lights became standard equipment on all Corvettes.
Corvette was ahead of many cars, putting options and so called "luxury" options on as standard equipment much earlier than other car lines.
If only they had carried the six taillights from the Stingray into the production Sting Ray, odds are the '68 and up would have had a six light style, so the center could have been a backup without losing a taillight on each side.