It's a few years since I dropped by Holden's Salmon St head office in Port Melbourne, but that is where the Holden concept cars were stored when not making special appearances ... you could see them from the street at the Turner St intersection, looking across the paved forecourt of what is also known as Caprice Ave ... check out Google Earth street view and in the image (it dates back to 2009) you can clearly make out Utester and Mambo Sandman behind the glass. Torana GTR-X is a beauty ... here's a YouTube link relating to historic B&W testing footage :