I need one of these too, n2hst@hotmail.com if you still have it.

I suspect if the load guard is in a bag as described, it is the mesh net which fits above the rear seats.
A heavy duty metal load/dog guard is available, but this is quite a substantial bit of kit.
It fits side to side and floor to roof (gap of approx. 4" at the bottom).

Heavy duty load guard like the one I have:-

http://www.ebay.co.uk/itm/Genuine-Or...item3cd45308f9

Item no. 261260249337