Do you already have pegs? If so, then you will just need clamps (1-1/4" I think) and female peg mounts that bolt to the clamps (y-shaped thing). If you need the pegs too you can buy complete kits (clamps, mounts, pegs) from Kuryakyn and I'm sure others aftermarket manufacturers as well.
Kinda hard to give you a precise answer as there are numerous different sizes & setups available. The last ones I bought were Kuryakyns Longhorn adjustable pegs which I liked - they had quite a bit of adjustability in height, angle, & distance from me. Most clamps should attach to your engine guard where it sticks out a little from the lowers on the sides.
Hopes this helps you at least get started...
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2004 FLTRI - Custom Paint: Glacier White Pearl & Vivid Black with Blue Flake, 12" Buky Malos, Dragos Dragula, Monroe DIY Air Shocks
2001 XLH1200 - Black & Chrome