G'day Bruce,
I visited REMLR and found a link which has the list of ARN numbers for gunbuggys
http://remlr.com/forum/index.php?topic=9.msg42#msg42
Also more photographs of these vehicles.
There was a quick shot of a gunbuggy on the ABC Anzac day march in Brisbane however the camera crew seemed more interested in shots of the crowd just as it got closer into view
Kind Regards
Lionel