I found these highway pegs at Honda, Suzuki, Arctic Cat in Sanford, NC. Haven't seen them on any other site. They are a pretty sweet set of pegs though. And yes, you can still put the engine guards on.
If leaned over far enough pretty much any highway pegs that are low enough to be comfortable may touch with the foot pegs folded down. Same thing with some centerstands and skidplates.
When I crotch rocket at low lean angles my highway pegs are folded up and my feet are on the bike's pegs, next to the shift lever.