the 55-59 'standard' wheel was 15", with 16's optional for higher GVW - they all had 3 clips for the caps, earlier rims had 6 clips, later had no clips, but still had the holes for them and they can be added
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics