There are a number of floorboards available for sportsters/dyna (actually though about them myself) and they fit the clevis mount where the foot peg goes and many are adjustable. Touring model floorboards will not work as they mount to the frame.
saw a Sporty with boards didn't like the looks of them put on a set of Kuryakin dually's they look sharp onmy Sporty.Buddy got Kuryakin ISO wings on his they look good too
I put the pegs with stirrups on my Low Riderand really like them. Might be a problem with slip-ons; the 2-1 pipes sit back a lot further than the SE-ll's did. These are from another after-market company, but I can't recall the name. I bought them used off this site. Price-wise, they're about the same if you go with the Kuryaken big, flat peg with the iso pad on it and the stirrup heel. Pardon the dirty garage.
Ebay (2orangeharley) has mini-floorboards for Sportster. I had ordered flame floorboards, but only fit w/mid-controls. Returned them for the rubber top floorboards..will receive in a week or two. You want adjustable floorboards so brake and shift levers aren't in the way. The price was right and vendor is easy to work with.