Yes, they will work. Both are 6 x 5.5. Im not sure about the width, but that wont stop using the older rim. The 62 rims will probably have clips for the hubcap retainers and the 66 should have three bumps on the front of the rim that hold the hubcaps on.


http://s971.photobucket.com/albums/ae197/jon63c10
1963 c-10 shortbed stepside 427 BBC T16 HD 3 speed
1963 c-10 shortbed fleetside 348 "w" 1st gen big block & powerglide