Thanks damienengland for the pics. It helps visualise what used to be there.

I think I've found where the bracket went. Remember that this van *was* owned by The Joker and he could have been on ice.
These two pics solved the riddle for me.

DSC00047.JPG

DSC00080.JPG

- - - Updated - - -

The tags.

HX Panel Van
3/77
AHX 255248
GVW 1950
Seating Cap 2

Little tag
8M70RGH918974X

Model HX8W M 70
Body No. 226227-A
Trim 1888-18V
Paint 568-15951
Eng L32
Trans M20
RRAxle GV7