Oldtuleguy said:
"...kinda looks like duro indestro made..."
Duro Chrome did offer gland nut sockets and Alamite sockets in their early catalogs. I have never seen any such listings in an Indestro catalog.
What you've got there is a different animal, but if it
were either Duro or Indestro, I'd have to say Duro.
I'd be taking a much closer look at the shape of the arc on the driver handles where the knurled portion meets the straight shank, and at that open-end wrench in the background of one of the shots. I think those might be a better indicator of who OE was on those than just the sockets.
Just my lousy opinion, but I'd be more inclined to think that Carter would have outsourced those elsewhere - maybe Bonney or Herbrand (or any number of other outfits who were in the game at the time that set was made.)