When doing replacement or upgrading on 2006 – 2018 Ford Fusion with halogen capsule headlamps, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight2006 – 2016 H11
High Beam Headlight2006 – 2016 H7
Front Fog Light2006 – 2016 H8/H11/H16
Back Up Light2006 – 2016 921
Brake2006 – 2009 4057
2010 – 2012 7443
Dome Light2006 – 2012 578
Front Side Marker2006 – 2012 194
Front Turn Signal2006 – 2009, 2011 3357NA
2010, 2012 3457NA
2013 – 2016 PWY24WNAHTR
License Plate2010 – 2012 12844
2013 – 2016 168
2006 – 2009 6418
Parking Light2013 – 2016 168
2006 – 2012 3357NA
Rear Side Marker2006 – 2009 194
Rear Turn Signal2006 – 2009 4157
2010 – 2012 7443
Tail Light2006 – 2009 4057
2010 – 2012 7443
Center High Mount Stop Light2006 – 2009 921
Door Mirror Illumination Light2010, 2012 12961
2006 – 2009, 2011 194
Glove Box2006 – 2012 194
Trunk2013 – 2016 194
2006 – 2012 211-2
Low Beam Headlight2017 – 2018 H11
High Beam Headlight2017 – 2018 H7
Front Fog Light2017 – 2018 H8
Back Up Light2017 – 2018 921
Front Turn Signal2017 – 2018 PWY24WNAHTR
License Plate2017 – 2018 168