3B,

The USA MPC shows them to be the same?
casting code 5450822
part number: 5453818

But, replacement parts are 1 1/4" bore and the MPC shows the original bore was 1 1/8" core (I think)?

NOTE added later:
morerog: I suggest following 3B's advice/information.The 1952 Specifications Manual confirms 3B's information (the 1953 Manual is unreadable). The MPC must be incorrect (Or, I am reading it incorrectly)?

Last edited by tclederman; 11/18/2019 1:05 PM. Reason: note added later