The black and red wheel is definitely an RH-5 (widowmaker). The wheel at the bottom of the sequence is an oddball- - - -it has a very narrow locking lip on the removable bead, with no extra lock ring, with a couple of milled-out spaces that won't be visible until the tire is deflated and the beads are hammered away from the flanges. To remove/install the ring, part of it must be pried over the lip of the main wheel and hammered sideways on and off. That style of lock ring was most commonly used on the 18" tube type wheels used on 1 ton vehicles. My 1959 Chevy 3800 had them installed and they're VERY susceptible to rust damage to the extremely narrow locking lips. 20" wheels with that type of lock ring are pretty safe, but ONLY if the locking grooves are rust-free and unworn.
Jerry
Ok I was thinking the one wheel was an RH-5. I was trying to figure out what the other one (the last one pictured on the LR of the parts truck) was by looking at the scan from the old Budd catalog without any luck. The remaining three on that truck are the AR type. That particular wheel is susceptible to rust damage making it unsafe? This has turned into a good discussion of wheels and is informative. I am still wondering however if anyone has any idea what the deal is with the two different style rings on the AR wheels like I showed in the first two photos.
