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I was wondering if the lens off a 67 or newer fit the 66's. They look the same but I want to know before I buy a set. I want to have reverse lights and mine are the straight red lens.
The lens will fit, but be advised there are no provisions in the original truck wiring harness or anywhere else to setup a reverse light.
Check your state's laws. When I moved to another state which had vehicle inspections, they required me to either put in a backup light system because the lenses were setup that way, or to revert to the original solid red lenses.
Stupid, I know, even though I showed them the inside of the housing that there was no bulb socket, and that no bulb could be put in there. And I showed them the original lenses were no longer available. Their answer? Get it fixed or get a newer truck. (I ended up putting the NOS '66 lenses I paid big money for on the truck, got it inspected, and then put the back up light lenses back on.) There's more than one way to skin a cat!
Needless to say, I live now in SC. We we voted out the inspection laws.