Here's what I use on the engine guards (not underneath, outside at 3 and 6 O'clock)... no kit comes with 1 1/8" clamps thou. Small Iso pegs, stirrups, male mount to clevis, 1 1/8" quick clamps. (and stirrup filler pieces). 4050s on the other bike.
http://www.kuryakyn.com/Products/484/ISO-Stirrups-with-Mounts-Clamp
If you already have extensions coming from down low on the engine guards, then I would just use Dually pegs alone. (like the 4050s)