Link http://cgi.ebay.ca/Chevrolet-Camaro-SS-Hub-Caps-USED_W0QQitemZ280133165455QQihZ018QQcategoryZ14074 5QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

I say they are 1963 Impala SS hubcaps but a person on the Impala site says he ordered a new 1968 Camaro SS with these hubcaps.

I believe these were an option for 68 Camaro. They were not available in for 69.

They were also used on Impalas and possibly other Chev models.