I just dug through some photos and found two Daytonas with original ballasts that had the oval-shaped nubs rather than the smaller round ones. It was probably just a vendor thing, and I'm guessing that either style would be considered correct. For what it's worth, both of those cars seemed to have a silver cad strap rather than gold (one was so coated with overspray you really couldn't tell), but I know I've seen others with gold cad.