Talking to a pal that really knows vintage factory wheels, these were not a factory offered size within this time period. Date codes are for late 1966.

This size is mentioned in the 1965 & 1968 Chrysler Hi-Performance Parts catalogs, but they do not show photos of every application mentioned in the text. (I do not have the '66 & '67 books available to access)

Links to the '65 & '68 pages;


http://www.hamtramck-historical.com/_1965Hi-PoParts-01.shtml?load_img=9

&

http://www.hamtramck-historical.com/_1968Hi-PoParts-01.shtml?load_img=14


Photos;