A Antique
B Vintage
C American & European Classic Open
D American & European Classic Closed
E Pierce-Arrow
F Packard
G Lincoln through 1973
H Wood Bodied Cars
I Race Cars
J Derham Coachwork
K Unrestored to 1959
L Unrestored 1955-1973
M Mini & Micro Cars
N American Production: 1946 to 1954
O American Production: 1955 to 1961
P American production: 1962-1973
P-1 AMC
Q American Muscle Cars
Q-1 Chevrolet Corvette
Q-2 Chevrolet Corvair
Q-3 Ford Mustang
R European Japanese and British through 1973 (to be divided based on entry mix)
R-1 Mercedes-Benz Automobiles
R-2 Jaguar Automobiles
R-3 MG Automobiles
R-4 Triumph Automobiles
R-5 Porsche Automobiles
R-6 Morgan Automobiles
R-7 Austin Healey Automobiles
R-8 Borgward Automobiles
T Ford Thunderbird
U Vintage Commercial to 1973
V Vintage Motorcycles
W Vintage Trailers & Campers
X DeTomaso
Z Stationary Engines and Tractors