1951-55 Kaisers were equipped on the line with a type 1/2 filter. This has oil lines attaching to a sealed canister; you remove the lines and throw out the sealed canister when you want to change the filter. Even before 1951 Kaisers went out to dealers, a factory memo indicated that dealers could make more profit selling new Kaiser owners the replacement element filter (there is a part number for the kit) instead. After 5 or 6 oil changes, the cost of changing to the replacement element unit would pay for itself compared to the cost of canisters.
K-F offered both Purolator or Fram types in the box (more often, it was Purolator) based on what the dealer had. Some dealers also used aftermarket brands to replace the canister.
The good ones use the spring to push down on the top of the element. By the way, the engine compartment photos show a car with the wrong air filter.
