Actually, I believe that backup lamps were an option in 65 also. I knew a guy that had a concours correct 65 and it did not have the backup lamps. They were standard equipment in 66 though.
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2000 GT --
Black, 5sp, Mach460, Bassani CatBack & X-Pipe, MAC Cold Air, 70mm TB, Tri-Ax Shifter
1966 Mustang Coupe --
Tahoe Turquoise, Pony Int, A-Code, C4 Auto
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scott@pearland.com