Lemme see what I've got (by absolutely no means a complete list)...
* Harriet, seemingly the show's first African-American model, very early in James' run. Can be seen on #006N, one of the episodes uploaded to TVPMM's YouTube channel.
* Jenny, circa 1974. One Showcase had her as an artist "painting" depictions of the prizes (or at least that's what I gathered from J-Shea's audio recordings).
* Ann Pennington, Janice's sister, circa 1976.
* Holly Hallstrom, appeared during the 1977 portion of Season 5.