In 1967 Rally-I-wheels have been the correct option for Firebirds and GTOs, although at the end of the year the Rally-II-wheels were available, too. These got widespread in and after 1968 so the other way round - using Rally-I-wheels on a 68 Bird as I currently do (because I like them more than the Rally-II-wheels) - would be incorrect.
(Rally-I-wheels, not really correct because the center caps should be painted black in the recessed areas - and even more incorrect because of being installed on my 68 car)
(typical Rally-IIs for a 68 Bird, here still without the trim rings and the small center caps. They are still in my garage, waiting for getting installed...)