Been scouring the code of practice and relevent adr's and so far I have these points to highlight.
quoted from NCOP7 Section LK Seating and Occupant Protection V2 01Jan2011
Modified vehicles must continue to comply with the Australian Design Rules (ADRs) to whichthey were originally constructed, except as allowed for in the Australian Vehicle StandardsRules (AVSR). These modified vehicles must also comply with the applicable in-servicerequirements of the AVSR.Modified pre-ADR vehicles must continue to comply with the AVSR.
So I started searching the ADR's and so far I have found nothing covering seats prior to 1971 and even then it only covers seat anchoring not construction. Now being that my Bug is a 66 it means the car never had to comply with these adr's so that would make it exempt from this rule?
Trying to look up the AVSR's to see what they say but having trouble finding them.