'66 GS 'Venti-ports'....
Forum member Wheelz had some for sale, freshly rechromed.
Yes, they are scarce. Nice sets are very hard to find,and pitted ones are out there but very expensive to restore..... much like 1965 taillight chrome!
I'm partial to the '66 version vs the 67 scoops. IMO, the '66 is a nice accent, while the 67's just look fake! 1968 featured a 'cowl-induction' that could perform but lacked a real performance look. 69-up had the 'look' but wasn't quite as functional.....no ram effect, just cold air.
If you want stealth performance, a ram-air setup using ductwork pulling air from a good location (under bumper, headlight opening, or around the radiator support) is a good alternative to a hood scoop. 1968 had an optional setup that pulled fresh air from the cowl vent area thru the firewall!