Look in your local Yellow pages under Automotive, alternator & starter rebuilding / rebuilders .. they will have what you need. It would also be easier to take it in to them to do the overhaul. It is not just the bearings and they are hard for a DIYer to change themselves. They are pressed on to the armature and pressed in to the end housings. You will also need new brushes and the regulator / diodes need to be checked or replaced to ensure a long life after the rebuild.
Hiamp alternator&starter
2001 w market st., Louisville, KY 40203
Tel: 502-741-0846
Reese's Auto Electric
817, FLEMING Rd, Maysville, KY 41056
606- 564-3111
Maysville Alternator & Starter
408 Wood Street, Maysville, KY 41056
606-564-9223
Carter Alternator & Starter
2417 Ralph Avenue, Louisville, KY 40216
502-447-7992
Since I don't know exactly where in Kentucky you are, these are some search results.