Why Low Numbers in 1969?
There was a lot of competition for new car buyers in 1969. The Barracuda was on it's 3rd year of this body style and it was getting "old". There were approximately the same number of Z-28's sold in 1969 as there were for ALL Barracudas, not just high performance models. Mustangs and Camaros outsold Barracudas by far, not even close. Also, the 69 Road Runner was very popular with the Mopar guys. Even when Barracudas were new on the streets, we were somewhat scarce. And regarding the Duster in the earlier post....it didn't arrive until the 1970 model year.
The good thing was, parts were later available, maybe because the cars didn't sell well. In the early 80s. I would go into a dealer and order every new part I could for my 69. I shoulda bought more than what I needed.