If you're talking about the ones you see on
some S4 Monsters, those are (aluminum) Superbike units. Not a direct bolt-on, as some welding has to be done on the mount to get the stop position correct.
IIRC, the new S4R has an aluminum sidestand also, but I don't know compatibility with other models. Ducati has yet to release the parts catalogs on their website.
There was a rumor a while back that CycleCat might do a billet sidestand, but I haven't heard any more about it.