I’ve mounted a Thor seat to a previously owned S40 and on my current V20c and did it without modifications to the frame of the bike or seat, just drilled two holes in the seat area, that lined up with the holes on the frame tabs, two up in the back area for a zip tie to hug the frame. Two nuts, bolts, nylon washers to protect the carbon, rubber grommets between frame tabs and seat, Velcro on back of seat, one zip tie up top, nice and secure. From unboxing of the Thor, to install, to riding, less than an hour.