Here are the 1878 (Chrome Yellow) Sandmans I have recorded:

7 x vans.
1 x ute.

Breakup:

3 x 270 1878-30B, L31 M21
2 x 270 1878-30B, L32 M20
1 x 270 1878-39B, L31 M21
1 x 270 1878-39B, L32 M20
1 x 480 1878-39E, L31 M21

So including the ex-Greg van I have 3 x identical spec vans recorded, and 5 x in brochure spec (as we don't know what running gear the brochure van had).

As for the Barbados Green brochure ute, I have this:

1 x 480 1877-30E, L31 (box unknown) - this is the brocure ute spec AFAIK
1 x 280 1877-30B, L31 M21
4 x 270 1877-30B, L32 M20

In my opinion the HQ Kingswood XX7 in L31 spec is the one to have, and that brochure spec car is the gun, fighting out for "big dog" status with Greg's van. Either way they'd be both worth having! I'd still rather a 1974 HJ Kingswood XX7 in L31 M41 but that is just me!