Rear brake pads remove and replace 2012 hd tri glide ultra classic

Check Drag Specialties or Dennis Kirk. Both have websites.

remove two tiny torx head screws and pull them out of the caliper
remove old pads
clean and push piston(s) into caliper

easier with wheel off, or axle pulled out so caliper can "float"
a toothbrush work well with some brakecleans