No, not a Belmont but a Holden van.

Everything about it screams NOT a Sandman. not sure why everyone keeps thinking it is. It has 67C trim, column shift and no headlining strips.

The story is full of holes too. Box most likely will have been a TH350 not a TH400, it would have had alloy rally rims not "GTS" rally rims.

Support vans weren't for Brock, they were for the 3 (later 4) rally cars. Brock was a driver in one car.