My wife's impact Red impact shorts are also of a different model. She complained the back d3O sheet did not really reach the tail bone and in many of the falls she landed on her back, it hurt bad. This season she has got a pair of Mcdavid impact shorts and she says the soft padding on the back does indeed reach the tail bone. Mcdavid does not employ d3O though and their impact shorts are even more expensive than the Reds. My own impact shorts are of another brand from Japan and it uses d3O.
The diagram you provide seems to be a pair of impact shorts with a d3O right at the back. Have I mistaken?