Actually, for cars, 68 was the first year for lights, and I think GM was just behinde the ball game and they were supposed to be on pick ups too...bit I can not prove that. (Kinda like the fact that the rear view mirror was still an option in 69 but was fed. mandated)
The side markers on these trucks were an option in 68 and 69, and in 70 they became standard.
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