Could this be a HZ Sandman?

[Frosty]

Only on the "Vehicle Identification Certificate" inside the cover of the service book, will you find Sandman. That's where you will find the relevant information, next to model name will be "SANDMAN", all of the other details for the vehicle will be there also. The book's will be the same as all the other ute & van book's apart from that certificate.

Should have told that to "Joe Verhagen Holden" in 1978 because they wrote on my Sandman vehicle identification certificate "Model Name 8WM70". It definately is a Sandman. All else matches including 18V trim
Cheers.