I have the Sixty8 series seat with the cafe cowl. Thinking about where the screw holes are on it, I think they are roughly in the same place as the picture of the rack. The only difference I think is that from what I remember there is not much of a dip to the rear seat where as on the picture of the rack seat it looks like there is a significant dip, or just no rear seat at all. I will try to get a picture or two of my seat with, and without the cowl on for you tomorrow if I get a chance.
If the rack and cowl are interchangeable then that would be great for switching between a cafe and touring set up.
"Only a biker knows why your dog sticks its head out the window."
Keepin' the shiny side up, and rubber side down, since 2005.