I have some photos of the van for the book, mostly black and white though. There were 4 x cars, all in Tuxedo and Sienna trim except the coupe which got LE trim:

HX Van
Bedford
LX SS
HX coupe.

I thought I may have had the van recorded as I have a 2214-65A HX van but it is only a 4.2 manual and most special show cars were all top spec driveline ie L31 M41 or in the Torana's case L31 M40, however the Seawitch appears to have been a 202 3spd so it is possible the van I have recorded is that van. I'm not sure if the HX is a Sandman or not, it does have Lukey mirrors and a Kingswood grille but its headlight surrounds are wrong and so is the bar and chin spolier, so hard to tell.