I think only the early Astros had these, as they don't seem to appear on later models. They were very small and I would imagine not as easy to use for seeing to the rear. I used these because they are rare. I also prefer the larger mirrors. Ok , i never brought this or the chevy kit back in the 70's because i thought they were the only mirrors in the kit . I only found out later on that there was a choice of mirror . My truck was built from the latest reissue of the Astro kit, but the mirrors came from an original issue Chevy Titan kit. I believe only the original Astro/Titan kits had these mirrors.
Nice Titan, Ken. I love the background, too.