My original '68 & '69 Roadrunners had red pie tins; I believe them to have been original to the cars due to the wear & corrosion spots on their undersides that matched the air cleaner lids. One of the '69s was an A/C car. All were St. Louis, except one'68 from the L.A. plant. IIRC, the latest SPD of my '69s was in April '69, and that may have been the Air Grabber car.