He's replacing the entire bezel. OP just wants to replace the bulbs. The easiest way is to remove the headlight housings and go in from the top. I believe it's only 2 screws that attach the headlights.
Current- 2016 Race Red Focus ST1
Traded In - Sedan Revolution #249 - 2012 SE Sport - ╠╬╝ - Ingot Silver - 201A - K&N w/ snorkel delete - Blox Type R Knob