The mainstream HQ passenger car range consisted of four-door sedan and five-door station wagon models in three trim levels.

[1] The long wheelbase luxury model, "Statesman by GMH" consisted of one body style (four-door sedan) and was available in two trim levels.

The commercial vehicle range included coupe utility, panel van and cab chassis truck models.

[2] A Sandman option, which was offered on utility and panel van models from January 1974,[6] included various "sports" items from the Monaro GTS.

Many local automotive component businesses in all these states across Australia supplied the main plants with many other parts, such as wiper arms, glass, carpets, electrical systems, fasteners, and the like.

The Kingswood was a slightly midrange, just like the Special it replaced, with a more stylish interior, featuring armrests as standard, and added exterior chrome.

The SS was a limited edition variant of the Belmont V8 Sedan, Option code XV8, Featured a 253 cubic inch Holden V8 as standard, with an optional 308 cubic inch V8 variant optional, mated to an Aussie 4 Speed Gearbox, and 3.36:1 Ratio 10-Bolt Salisbury differential as standard, making the SS a hit among younger power hungry drivers, so much so that a Series II SS was released after the Series I run failed to meet demand, in the end, Holden had produced 2800, The SS also featured a Black Roebuck Vinyl Interior with Houndstooth or Flax-Raydo inserts, Standard arm rests, center console with floor shift, Sport Steering wheel and a full GTS dash cluster.

The GTS was a specification of the HQ Holden Monaro, Based on the Kingswood, decked out with all the bells and whistles, the GTS featured its own stripe style, available in most colours, along with a choice of 253 or 308 Holden V8s, mated to either a 4 Speed Holden manual or 3 speed GM Turbo-Hydramatic 350 automatic, backed by a heavy-duty Salisbury differential, the GTS package featured a full interior with optional houndstooth seat inserts in standard bucket seats, sports steering wheel, center console, tachometer, dual split gauges (pictured) and more.

With the introduction of the HQ model, Holden's factory supported production-car racing efforts shifted from the V8 Monaro to the smaller six-cylinder LC Torana.