Determine the Id and OD the bearing will need to be then visit your local industrial bearing supply company.
Don't feel bashful about needing to install as many as 3 4 or 5 bearings in the casting where the bronze bearing was angular contact bearings can tolerate slight amounts of side thrust as well as radial. I would consider using a combination of angular contact and radial ball bearings additionally you will require a flat thrust bearing.
By stacking angular contact bearings back to back or front to front of each other you can situate them to have a preload