Sorry for the late response. My '69 is a 05A Norwood built coupe.
As Ed noted from the 9/1968 edition parts manual, the gasket #3015053 was called out for 69 All except Corvair, and gasket #3929038 for the 68-69 Camaro convertible. Its interesting that JohnZ and GordonOne 02D build cars did not have the gasket. I wonder it did not make into the production assembly until mid year, or if the gasket was only issued as part of a service parts package?
I hope to hear back from others with original RWD, and what their build date and plant is.