the front (or rubber facing) side of the pedal cover. this is really minor work. test the fit a couple of times to determine when you have done enough grinding. when you got it where you want it, slap a whole lot of gorilla glue (or similar) on the face of the honda brake pedal.
place the pedal cover over the pedal, adjust into position and tighten the 4 screws that close and hold the pedal cover. let it sit for 24 hours and you’re done. 