Okay, here’s what I find. Your C-18596 has a Goodyear DT style rim with split outer ring, its dish is 3 5/8”, it is 20” x 3.75” (5” old measurement system). It has the early 5 x 6 7/8” pattern.
Your C-32898 has a Firestone RH style rim with continuous unbroken RI style ring. It is 20” x 3.75” (5” old system), 3 3/4” dish, and the early 5 x 6 7/8” pattern.
Your third wheel is I think might be #23597. You’ll have to tell me if it matches the 20” x 3.75” width, 3 3/4” dish, and same 6 7/8” pattern. It also has a Goodyear DT rim and split ring. I went through Budd’s 1933 catalog looking for wheels having the first digit “2” and last digit “7”. This is the only one meeting the size and width comparable to your others. Stu