Definitely Sandman ID plates, and they all align fine. It is a 9/77 hence the lower GVW than later HZ. Whether of not the plates belong to the body is another thing, but by the sounds of it they do.
Another of that big glut of pre 12/77 Dandenong HZ Sandmans that I have recorded. They really pumped them out of that plant prior to them ceasing HZ production before the end of 1977 - there was only one HZ completed in Dandenong after 31-12-77.
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