Hi John, just a note, Edgar Kaiser's car has Keystone wheels on it so it has no hubcaps.
It may be a bit misleading since the car is a 1951 but it looks like a '53. Actually, my guess is, the people that put it together for Edgar took a 1953 and put 1951 tags on it. By all features (and there are many) it's a '53 but the body, data and VIN tags all say "K514...." on them and the title stated "1951 Henry J..." so that's the story on it.
You likely are referring to my '52 Vagabond, which has the small stainless caps on it -
There were two versions of that cap, the stainless and one was actually chrome. You see the chrome ones more often on the later ('53-'54) Js. They have the same part number but what distinguishes them is the chrome ones have more squared edges around the K and the circle whereas the stainless ones the edges are a bit round and they definitely have a different sheen to them.
To answer your question regarding the rotor; The Henry J parts book lists the same part number for the four and six cylinder rotors. The difference is whether it's an Autolite or Delco-remy distributor. If your car is a '52 Henry J Vagabond, that means it was an unsold '51 that was retagged/badged as a '52 and it would have Autolite. If your car is a '52 Corsair, it most likely has Delco-remy.
KF Part number for Autolite rotor is 212623, which is a NAPA/Echlin ECH AL104. KF Part number for Delco-remy rotor is 208288, which is NAPA /Echlin RR83. I've never known one to fit loose. NAPA can usually get them in a day or so and they're not too expensive if I remember correctly.