Eyebrow / fender extension trim

I have seen both styles factory original on 72's so I bet it was a mid year change. Best thing to do is count your mounting holes and get the trim to match your extensions.
To further complicate things, there are also fiberglass extensions. Im pretty sure the trim was interchangeable between the fiberglass and pot metal ones. Not sure but I think the fiberglass ones were probably 70 only.