Fan Mount suspends a 40x40x10mm fan with two screws & is designed to maintain the LC's extruder at original height by mounting on top of its bracket instead of underneath it.
Fan Cone bolts to the bottom of the fan with the same two screws & is designed to focus cool air over the work without obstructing too much of your view.
If using Pronterface, open "Settings"/"Slicing settings" then click "Print Settings" tab in Slic3r and enable "Generate support material". This creates a disposable scaffold while printing Fan Mount's overhangs.
I tried wide & narrow Fan Cone's but liked the narrow one better because it doesn't hide the extruder from view as much. Cooling seems to be the same either way.
Prep 40x60mm reflective side aluminum foil by folding twice and wrap around extruder-side of Fan Cone (see photo). Affix w/tape on cold side of cone. This keeps extruder from melting the tip of Fan Cone.
Bolt Fan Cone to Fan & Fan Bracket first, then loosen top stepper motor screw and swing aside to gain access to L extruder bracket screw, repeat for R screw. Remove washers, insert Fan Mount w/screws only. Check clearance of Large Gear vrs. left Fan Mount bracket, trim bracket if necessary. Swing stepper back into place & secure.
Don't forget to "enable cooling" in Slic3r !