Direct answer
If the vehicle is registered in South Australia, use the SA vehicle standards and modifications pages. VSB 14 is the national technical text. SA decides the form, the examination and the accepted signatory.
How to use the SA pages
Look for information on modified vehicles, individually constructed vehicles, and any code or engineer pathway the department names. If a URL has moved, start at sa.gov.au and search “vehicle modifications”. Do not fall back to a copied table from another state.
Next
State rules hub. Check with the SA department or a signatory they recognise before you modify the vehicle.
