Posts #27 & #45 show late model Caddy tail lights on stepsides. It doesn’t identify the owner of the truck, but perhaps a photo of what you’re after will help bring in more responses.

http://67-72chevytrucks.com/vboard/...p;highlight=caddy+tail+lights&page=2

1960 GMC 1/2-Ton Pickup Truck
In the Gallery
Updates in the DITY Gallery
Now cruising in the Passing Lane