When doing replacement or upgrading on 2007 – 2018 Lincoln MKZ with capsule halogen headlamps HID, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Low Beam Headlight 2007 – 2012 H11
High Beam Headlight 2007 – 2012 H7
Front Fog Light 2007 – 2012 H8/H11/H16
Back Up Light 2007 – 2012 921
Dome Light 2007 – 2012 578
Front Side Marker 2007 – 2012 168NA
Front Turn Signal 2007 – 2012 3457NA
License Plate 2007 – 2012 12844
Parking Light 2007 – 2012 3357NA
Rear Turn Signal 2007 – 2009 3157
2010 – 2012 HPC24NA
Center High Mount Stop Light 2007 – 2012 921
Door Mirror Illumination Light 2007 – 2012 12961
Glove Box 2007 – 2012 194
Inner Tail Light 2007 – 2009 161
Trunk 2007 – 2012 578
Low Beam Headlight 2007 – 2009 D1S
2010 – 2012 D3S
High Beam Headlight 2007 – 2012 H7
High Beam and Low Beam Headlight 2017 – 2018 D3S
Front Fog Light 2007 – 2012 H8/H11/H16
Back Up Light 2007 – 2012 921
Dome Light 2007 – 2012 578
Front Side Marker 2007 – 2012 168NA
Front Turn Signal 2007 – 2012 3457NA
License Plate 2007 – 2012 12844
Parking Light 2007 – 2012 3357NA
Rear Turn Signal 2007 – 2009 3157
2010 – 2012 HPC24NA
Center High Mount Stop Light 2007 – 2012 921
Door Mirror Illumination Light 2007 – 2012 12961
Glove Box 2007 – 2012 194
Inner Tail Light 2007 – 2009 161
Trunk 2007 – 2012 578