I'm thinking there was an engineering change, they planned on using a Slinger and then changed their minds and needed a spacer until they corrected the issue in '56...just a guess.
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD