I do not know if it has been covered before. I have a 1984 16 ft
scamp . With what I think is original
axle. I replaced both inner and outer bearings. Both bearings fit a 1/1/16in
axle . Some older 16 ft have larger inner bearing. Some 13 ft use the same bearings. The good news is I bought bearings races and seals . The seals did not fit . Had put new seals earlier. I bought at tractor supply for $40.00. I hope info helps some one else. thunter