I have a 67 convert, with the full size spare tire (14"), and will measure the location via the hole in the original factory trunk mat, if no one chimes in, as I have provided pics of the mat / hole to other members, and I believe the location is the same for 67 / 68, as long as it's the full size spare, and a convertible. PM me if you need pics or measurements. I replaced the complete trunk pan in my car and currently don't have the "J" hook mount plate installed.