They are not the same, you need the SM420 Bearing Retainer with casting number 591679 to convert a newer open drive shaft trans to the 1954 and back closed dive shaft.
There are a couple on ePay now, just search "591679 bearing retainer".
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD
