The ZL2 Special Ducted Hood became available to order as of 1 Dec 1968; first cars equipped with it were built late January 1969. The first two ZL-1s [12E] did have it and probably were the first but there was high-level intervention involved in those getting built at that time. No other 69s built before then could have had it.
No matter what you see today, relatively few SS and Z/28s were built with it.
