Vehicle Model Time.

[Taily]

From what I remember HQ was bench with no headrests, wheels were silver (early to late build) with painted hubcaps/some were fitted with Kingswood hubcaps with more black than chrome), then white wheels (very late HQ - the beginning of the HJ parts inventory) with HJ hubcaps. Clear blinker lenses as you point out on early, orange later.

HQ hubcaps:

HJ also had white wheels and the predominantly chrome hubcaps, silver on black "holden" metallic decal on rear chassis light bar/near number plate introduced.

HJ hubcaps:

HX-Z as you put it Doc but not sure about left hand mirror. I do know that an interior rear vision mirror was around a 10 buck option, dependant upon which body type was going to be fitted (bread truck etc), so would think an external LH mirror would have been mandatory in that instance.