1C = 1960's: up to 2500cc
3C = 1970's: up to 2500cc
5C = 1970's: over 3500cc
7C = 1980's: over 3500cc
9C = Pre 2008 2wd over 2501cc
11M = Modern 4WD
14C = 2 Day Rallye
2C = 1960's: over 2500cc
4C = 1970's: 2501cc to 3500cc
6C = 1980's: up to 2500cc
8C = Pre 2008 2WD up to 2500cc
10M = Modern 2WD
12M = Modern Muscle
15M = 2 Day Rallye