A 68 still had the same heater outlets in the rockers. Moved back and made really big for 69.
Also, a 68 used the same method of attaching the carpet along the bottom of the door opening on the rocker, just crimped. A 69 had the rubber strip like later cars.
Although, a 68 had the shifter moved back, so the early carpet kit would not fit if the hole was precut.