[markeb01]

The 6 clip wheel looks more like a 49 era wheel to me. I don't know what came stock on a 61, but my 1960 GMC came with wheels that looks like the first one. I have one remaining original, and it is riveted construction, has the 4 nibs for the 1956 passenger car 15" wheel covers, and 3 hub cap clips. It is 15x5. If this matches your set you're welcome to it for the cost of shipping. Being heavy I don't know how much that would be:







Fyi in 1960 if you order full wheel covers for your Chevy truck, 1956 Chevy car wheel covers were provided, presumably because 1956 was the last year the cars came with 15" wheels. 14" wheels became standard in 1957. The 56 wheel covers had a bead all around the perimeter of the flange that snapped in the wheel.
They did not feature conventional gripper fingers that dug into the paint. These wheel covers could only be installed on a wheel that had the nips stamped in.