Blocker, 100% not sure of the question, but I think the above all have answered it. Summarised:

Belmont:
HK-HX Sedan and Wagon.
HK-HQ ute and van.

Holden:
HQ-WB cab chassis.
HJ-WB ute and van.

Kingswood:
HK-HX sedan and wagon. Kingswood SL became the base model in HZ BUT normal Kingswood could be optioned for fleet orders by special vehicle package on Kingswood SL (I can't remember the code - I think it was A9K).
HK-WB ute.
HX-HZ van.

HQ: XX7 was optional on Belmont and Kingswood commercials.
HJ: XX7 was optional on Holden and Kingswood commercials. Later in model run XU3 was released and Holden ute XX7/XU3 dropped.

HX/HZ: XX7/XU3 on Holden ute and van.