Just go get a set of pad, they will come with 4 in the box, 2 for each side and you DO need to do both sides. We just did one of our TJ's, two new rotors, two new calipers and pads. Took about 20 min to remove and install the new stuff and another 10 min or so to bleed. Yours is even easier, unbolt, just push the old pad/piston back and lift it off, snap out old pads, snap in new ones, clean those bolts and relube them with the grease that comes with the pads, clean the area up and reassemble. Torque the bolts to 14ft lbs or so..