Stop in for a cup of coffee

All he does is 67-69 Barracuda's for the last 40 years, the last 20 as a full-time job. He knows them inside and out.
The red caps? Makes sense, but he have proof? I have never seen them, BUT I am not a pro like him.....He have a part number/reference from FSM?
s-l640.jpg
This was untouched as far as I knew.....1967