Hi
Thanks for the response's, yes it probably is the #594 model (I must have wrote 549 after one too many trips to the shed where the Fireball storage locker is located). Yes it is part #11 in the JDparts manual link that 'beenthere' shows, however it does not give the actual part # that I would need to order another one. I've contacted several bearing supply companies on-line and they do not have a match for the dimensions of this cylindrical roller bearing without a inner or outer race unlike most shaft bearings .
See attached pic (width/ 'C' = 2-3/4", I.D/ 'A' = 1-5/8", O.D/ 'B' = 2-1/2")