The aim of the Appendix J Association of NSW is to foster and promote Historic Touring Car racing in Australia in conjunction with other forms of Historic Car racing. Group N is recognised as part of the Historic 5th Category and enjoys the benefits extended to that category. Simple, fun and exciting racing. It comprises:
- Group Na, representing cars manufactured during the period up to 1958. Group Nb (“Appendix J”) up to 1964.
- Group Nc, which covers the period 1965 to 1972.