I haven't found evidence to say either way. In HJ it was engine type related, not luxury level. So it may be that way in HZ if it was standard. It could well be standard with U17 dash as you say. More info needed.
EDIT:
I just looked in the HX and HZ features manuals.
CD4 is standard in HX only on Caprice. This is as of Dec 1975 and July 1976.
In HZ it is standard in Premier, GTS, Sandman, Statesman Deville, Calais and Caprice. This is as of October 1977 (Calais was withdrawn just prior to HZ release and released later as the Champagne Edition HZ Statesman. It was basically a Deville with cloth trim). Optional elsewhere.
The above saying it was standard in Sandman bothers me as there is no mention of it as a component option or feature change as part of the XU3 Sandman package (feature change is a change in specification to the base vehicle that is part of the Sandman package and not a component option. A HZ Sandman component option example is M11 console shift. An example feature change is bright tail-light surrounds). I looked up U17 (full instrument dash) also, which is a component option of XU3, but it does not mention anywhere that CD4 is mandatory with U17 when it is optioned on Holden or Kingswood.
So we have contradictory information. This happens a bit with GMH documents, as Robbo will attest with the HZ tonneau on HZ Sandman ute. So we need real world examples of totally original cars to see what the case is with CD4 on HZ XU3 and XX7.
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