Please help me identify my van

[Bobcat68]

Saddle Tan Metallic is the paint colour.
Buckskin Trim.

From what you have supplied there is nothing to say it's not a Sandman.
Confirming it is more difficult. If you had the owners manual and sales papers that would give it away for sure.
Black-Outs should help. Door Handles? (Should be Black, never chromed) Sills, around door Window Frames, Top Tailgate Window.
Mirrors should be body colour. Headlight surrounds and grill should be blacked out.

So your looking for spare wheel lift ring. Full Head Lining, Factory console mounts.
Factory decals? Evidence of?

Ben goes off evidence and Holden papers, he uses Byron for Sandman ID's for an educated opinion. If you get the green light from either you'd be pretty safe.
That said, if you can find the evidence I've suggested you'll be well on your way.

Unfortunately when I bought the car all the books were missing. She has the short console, Black door handles & the blackouts & she had the side stripes but no rear or side SANDMAN decals. I had LPG fitted back in the 90s & ill have to see if the spare wheel carrier is still in my Dads shed ( he's a bit of a hoarder so its probably still there lol) Thanks for your help & Cheers PS How do I contact Ben or Byron?

[Innuendo]

Unfortunately when I bought the car all the books were missing. She has the short console, Black door handles & the blackouts & she had the side stripes but no rear or side SANDMAN decals. I had LPG fitted back in the 90s & ill have to see if the spare wheel carrier is still in my Dads shed ( he's a bit of a hoarder so its probably still there lol) Thanks for your help & Cheers PS How do I contact Ben or Byron?

Short console is known as a seat separator and not Sandman. Lifting the carpet and looking for evidence of the front full console mount would be worth investigation.
Decals were often not ordered in '78 people didn't want them. Not uncommon to have the Sandman words deleted either. Ben is HHS and Byron doesn't visit this forum anymore.
Post some photo's!