Dual Snorkel Hood Scoops

IMG_0081.JPG I bought a new Demon 340 in 72. Shortly after I bought it I went to the local Dodge dealer parts dept. and ordered a Dual Snorkel Hood Scoop, had it painted and put it on the car. I must have seen another new Demon with one to have known to get one. I forget the reason why.
My question is, when was the first year this scoop was offered as a factory option? Also was it first available on the Dodge Demon? When did it become available on the Duster?