When doing replacement or upgrading on 2000 – 2018 Ford Focus ZX3 ZX5 SE LX ZTW SVT ZTS Sedan Wagon Hatchback with halogen capsule 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 Headlight2012, 2015 – 2018 H11
High Beam Headlight2012, 2015 – 2018 H1
High Beam and Low Beam Headlight2000 – 2004 9003
2005 – 2007 9007
2008 – 2011 9008
Front Fog Light2000 – 2004 899
2006 – 2007 H1
2015 – 2018 H8
2005, 2008 – 2012 H8/H11/H16
Back Up Light2000 – 2007 3156
2000 – 2012, 2015 – 2018 921
Brake2010 – 2011 3057
2000 – 2006, 2008 – 2009, 2012, 2015 – 2018 3157
2005 – 2007 4057
2007 4157
Daytime Running Light2002 – 2011 3157
2015 – 2018 H1
Dome Light2005 – 2011 578
2000 – 2004 6411
Front Side Marker2015 – 2018 12396NA
2006 – 2007 168
2012 168NA
2000 – 2005, 2008 – 2011 194
Front Turn Signal2000 – 2004 3157
2005 – 2007 3157NA
2008 – 2011 3457NA
2012 7440
2015 – 2018 7440NA
License Plate2005 – 2011 12844
2000 – 2004 6418
Parking Light2012 168
2015 – 2018 193
2000 – 2004 3157
2005 – 2007 3157NA
2008 – 2011 3357NA
Rear Side Marker2015 – 2018 194
2012 3157
Rear Turn Signal2010 – 2011 3057
2000 – 2006, 2008 – 2009, 2015 – 2018 3157
2012 3757NA
2005 – 2007 4057
2007 4157
Tail Light2010 – 2011 3057
2000 – 2006, 2008 – 2009, 2012, 2015 – 2018 3157
2005 – 2007 4057
2007 4157
Center High Mount Stop Light2000 – 2004 12961
2005 – 2007 194
Map Light2006 – 2007 12961
Trunk2001 – 2004 12961
2005 – 2007, 2012 194
2001, 2008 – 2011 6411
Low Beam Headlight2013 – 2018 H11
High Beam Headlight2013 – 2018 H1
High Beam and Low Beam Headlight2002 – 2004 9003
Front Fog Light2002 – 2004 9145
2015 – 2018 H8
2013 – 2014 H8/H11/H16
Back Up Light2002 – 2004, 2013 – 2018 921
Brake2002 – 2004, 2013 – 2018 3157
Daytime Running Light2002 – 2004 3157
2015 – 2018 H1
Dome Light2002 – 2004 6411
Front Side Marker2015 – 2018 12396NA
2013 – 2014 168NA
2002 – 2004 194
Front Turn Signal2002 – 2004 3157
2013 – 2014 7440
2015 – 2018 7440NA
License Plate2002 – 2004 6418
Parking Light2013 – 2014 168
2015 – 2018 193
2002 – 2004 3157
Rear Side Marker2015 – 2018 194
2013 – 2014 3157
Rear Turn Signal2002 – 2004 3157
2013 – 2018 3757NA
Tail Light2002 – 2004, 2013 – 2018 3157
Center High Mount Stop Light2002 – 2004 12961
Trunk2002 – 2004 12961
2013 – 2014 194
Low Beam Headlight2002 – 2004 D2S
High Beam Headlight2002 – 2004 H7
High Beam and Low Beam Headlight2015 – 2018 D3S
Front Fog Light2002 – 2004 9145
2015 – 2018 H8
Back Up Light2002 – 2004, 2015 – 2018 921
Brake2002 – 2004, 2015 – 2018 3157
Daytime Running Light2002 – 2004 3157
Dome Light2002 – 2004 6411
Front Side Marker2015 – 2018 12396NA
2002 – 2004 194
Front Turn Signal2002 – 2003 3157
2004 3457
2015 – 2018 PY21W
License Plate2004 12844
2002 – 2003 6418
Parking Light2002 – 2003 3157
2004 3357NA
Rear Turn Signal2002 – 2004 3157
2015 – 2018 3757NA
Tail Light2002 – 2004, 2015 – 2018 3157
Center High Mount Stop Light2002 – 2003 12961
2004 194
Trunk2002 – 2004 194