The quality of the seat really made me think it was some sort of option..
That was hanging me up, too. Still.....
The front matches the rear, and is stitched. Ducati did not sew these seats, they were a one piece section that was simply wrapped and stapled to the seat pan. Even bipostos had black seats for the operator, some had black passenger seats, while others had body color-matched. I have never seen a body color-matched front seat, and could not imagine an upholstery shop matching it that closely.
Yup, definitely not factory. Ducati would not have used Phillips head screws, they would have been metric Allen head at the very least. Most likely, they would have used studs and 8mm nuts, like the front has. The rear p-pad on my biposto is held on with four 8mm nuts on studs, just like the front, and every bipo that I have seen has used this, as well. Ducati would never use Phillips headed screws, much less use two+ different sized Phillips headed screws.
Also, that hole pattern looks very asymmetrical and sloppy. Ducati would have been a lot more professional about it.
Also, having this pad hold the weight of the passenger, Ducati would no doubt reinforce the seat mount area, as the cowl would never be able to properly support the weight of a second rider up there, without spreading outward on the sides and eventually breaking. They would have no doubt made a bracket that went from the subframe or the bottom of the seat, for support.
Remember that the seat cowl to these bikes is only mounted solidly at two places, the hinge and the latch. There are two high-density foam rests, but these are not secure mounts, only rests. Everything that has to support weight (operator seat and rider seat) will have rubber feet that rests on the subframe, to directly support the weight applied. Keep in mind that these cowls are nothing but injection molded plastic, and there is absolutely nothing underneath this part of the plastic seat cowl that actually touches the subframe. One sit by Rosie O'Donnel, and that sucker's gon' split like a cheap pair of pants. Even the weight of a small person would eventually stress the platic to the point of paint damage, at minimal. Lastly, removal of such a p-pad would leave four holes in the seat cowl, as well as paint damage, if used.... something that Ducati would never allow.
Gonna say definitely a previous owner add-on. I cannot imagine in any realm of imagination that Ducati would do such shoddy work, and open themselves to the numerous warranty repairs for a split seat cowl.
Also note the turn signals incorporated into the upper vents. It looks like they may have tried to duct tape then to the underside, to mount them. Definitely indicative of the same shoddy worksmanship that the seat was mounted with. Certainly not Ducati quality.
Get yourself some 3M plastic repair (or take it to a body shop) and have it filled and repaired. Then, take that p-pad and kill it. Kill it with a gun. Kill it with fire. Kill it like it has dirt on the Clintons. Kill it in any way you can! And if it still wiggles, kill it again!
Then, find the previous owner who did this..... hunt him down like Indiana Jones in an eternal quest for the Holy Grail. And when you find him, whack him on the nose with a rolled-up newspaper for doing such a monstrosity!