John, you need to get in touch with Auckland Car Club and Northern Sports Car Club about the early days of Rallying in and around Auckland with the Millen boys being part of that scene, both Rod and Steve, rallied in a beach Buggy VW based to start with [ memory here ] and i do beleive that as it did not have a roof, just a roll cage were told it had to be a closed car so .. a sheet of metal was attached to the rollcage making it a ' closed ' car.. think they won the first NSCC Woodhill Rally in 1971 in the Buggy.. Many others will know a lot more