some useful info for anyone modifying their car!! National Code of Practice for Light Vehicle Construction and Modification (NCOP) National Code of Practice for Light Vehicle Construction and Modification (NCOP) (general info on all light vehicles) Second Edition Australian Design Rules Second Edition Australian Design Rules (covers cars produced from jan 1969 to july 1989) Third Edition Australian Design Rules Third Edition Australian Design Rules (covers cars produced from july 1989 to current) Vehicle standards information sheets Vehicle standards information sheets (nsw rta how to modify your vehicle properly) Hope this can help everyone!!