Chicken wire was used in the 68/69 Pontiac A bodies.
However, the plastic inserts are shown in the 69 assembly manual in addition to the screen.
I don't ever recall seeing a 69 with the plastic inserts however. I always thought the plastic was used for the 1970 models
68 / early 69
It appears the changeover to plastic was around Feb '69
with an update in Mar '69
