Ok - just so that I am clear on this I have many questions for clarity on this.

HJ Sandman Vans had standard Holden/Belmont trim, but only a certain selection trim colours specific for the Sandman.

Early HJ Sandman Vans had no armrests.
Later HJ Sandmans utes and vans (somewhere between mid 1975/1976) included armrests.

However there may be a slim possibility that late HJ (post 4/76) may have had Kingswood style trim but there is no documented process for it, unlike the HX/HZ ordering procedure.

Maybe we should talk on the phone.