Dieseldude03's wheels are the Firestone/Kelsey Hayes "old style" "AR" three piecers. There is a small locking ring that holds the side ring in place. They can still be serviced. Tango's wheel is a widowmaker Firestone RH-5°. Cross section diagrams are below. Stu McMillan

http://i286.photobucket.com/albums/ll89/truckdog62563/Wheel%20Profiles/ARsideringandlockring.jpg
http://i286.photobucket.com/albums/.../budd1954FirestoneRH5degreeRH5degree.jpg