Posting some trivia here which may be helpful for people identifying fans and pulleys or contemplating instlaling AC on a non-AC car.

Non-AC fan & pulleys 1958 Continental 430 Fan spacer is 1-15/16" tall


AC fan & pulleys 1958 Continental 430 Fan spacer is 1-15/16" tall

Comparison of pulleys and fan mounting bolts- click to enlarge