A/C'd and confused

[Mike Culpepper]

I am looking to buy a '69-72 p/u and have a couple of Qs
with regard to A/C:
Where are the A/C "registers" (where the air comes out--register maybe the wrong term) on a '72? Are they UNDER the dash vs. IN the dash like several '69s I've seen?
I saw jmil74's 1969 p/u for sale and it has an A/C "register" that's under the dash and looks like a couple of the '72's I've seen. I am confused! I guess I want to know what a factory vs. an aftermarket or conversion type setup looks like on the '69-72 pickups.
Any help would be appreciated.
Mike C.