If they are original 1970 and 1971 issued wheel covers they will have this part number stamped in the center of the underside of the wheelcover: 2944 403 Since your wheel cover does not have that part number, it is a later incarnation of the original 1970-71 original "issue" if you will. They used this basic design on a lot of cars for a lot of years. For whatever reason, later issed wheel covers don't seem to have a part number stamped into them. I think that later issed wheel covers also have minor differences to them than the originals, but I do not know what they are. That part number by the way, is for a 14" wheel cover. They also came in 15", usually found on wagons and C Bodies.