Check with a place that sells trailers or boat trailers
Oklahoma City Trailer parts
http://www.google.com/search?hl=en&client=firefox-a&hs=fC8&rls=org.mozilla%3Aen-US%3Aofficial&q=oklahoma+city&as_q=trailer+parts&btnG=Search%C2%A0within%C2%A0results All the places I knew of are not in business, the oil crunch of the 80's killed most of them off.
Dexter axles are still there but the make axles... They might have parts...
Bearing Parts.
http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla:en-US:official&&sa=X&ei=YZtMTNHcBpSInQfF-bTYCw&ved=0CBEQBSgA&q=oklahoma+city+bearing&spell=1The length of the bearings matter. Most bearings have part numbers and who makes them on the big end flat surface of the bearings. The race, the part that the bearing rides on should have a manufacture and part number on them. You will need a long punch to drive those out of the hub. If they have big groves in them they will wear out your new bearings or even tear them up in a short time.
Timkin makes a lot of bearings