What did you do to your truck today.The 3rd chapter

['68OrangeSunshine]

Originally Posted by 72c20customcamper

Mine are both NOS one lens has 67 on it the other 71 . So they must have had an update but the one that says 71 the box is marked for 71 Chevy Flat bed

Edit: just snapped a picture of the one that says 71 on it

Well, I am confused. I can't seem to find any '60-'66 back up lenses in vendor catalogs to support my theory that the parallel-lined type were earlier than '68.
Here's my old OEM '68 lens, much crystalized by solar radiation.
You can see, with the concentric rings, the angle at which the lamp housing is mounted, isn't important, since it's a circle.
But with the parallel type, the lines on the Passenger Side run NW/SE, not level.