| The official(?) ducati panniers (by nonfango) have 3 mounting points
Pillion foot rest, theres an additional hole next to the exhaust mounting to the rear of the bike.
Lower frame beam under pillion seat, theres 2 extra bits of mental welded to it on the underside 1ft~ apart. You can't see these from the top. These take 2 more bolts.
In addition to that, indicators are removed and placed on the rack, there has to be holes in the underseat fairing for the rack to go thru to the lower beam, and the exhaust will probabily need to be lowered so as not to burn the panniers (feat. is builtin to the STs).
Hope that helps | 
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