Coupe Utility is what HQ-HZ utes were called. There were no 6cyl HZ Sandmans, the 4.2L V8 was made standard with XU3/XX7 prior to the start of HZ production. Apparantly 6cyl HX Sandmans were unsaleable, dealers thought they were standard with V8 like GTS and didn't option a V8 which left duds GMH couldn't sell, so they dropped the 6cyl for HZ.