19V was the standard black trim for early HZ Holden, EXCEPT if the car was either a Sandman or a Holden utility destined for sale in NZ (these got 18V). I don't know why the NZ base spec ute was given Kingswood trim, but I know why the Sandman was - this is because HX and HZ Sandman were meant to be a Kingswood specification vehicle. Hence the Kingswood trim, headlining, scuff plates, door switches, tail-light surrounds, grille badge, cigar lighter and bright rear window rubber (ute only). This is all well documented in GMH literature, which also states the HX/Z Sandman was going to be Kingswood based (as the HX range introduced a Kingswood van) but it was easier to upgrade a Holden van to Kingswood spec than it was to not fit the side strips to a Kingswood van to make a Sandman. Slate black (18V) as an option for XU3 and XX7 also dissapeared in July 1978 from the HZ ordering procedure and I have never recorded black trim 18V, 19V or 19W past July 1978.