The Mk8 is the Fiesta built 2017–2023. The registration's age identifier is the quickest check: 17 to 73 plate. The V5C gives the first-registration date, and this generation's fitments apply from the first 2017 cars onwards up to the 2023 run-out.
Dip beam (low)H7VerifiedHalogen trims; higher trims (Titanium+/ST-Line, 2020+) may have non-replaceable LED dip units
Main beam (high)H1Verified
Front fogH11VerifiedIf fitted; two generic catalogues list H8 — owner threads say H11
Sidelight / DRLW5WVerifiedSidelight bulb (501); DRL is a separate non-replaceable LED unit in the headlamp surround
Front indicatorPY21WVerifiedAmber bayonet, non-LED-indicator trims
Rear indicatorPY21WVerifiedAmber bayonet; tight access per owners
Brake / tailP21/5WVerifiedLower-spec models per handbook quote; higher trims LED tail
ReverseW16WVerifiedOften listed as P21W elsewhere — wedge (955)
Rear fogP21WVerifiedXenons Online Mk8 2018-2022 rear fog product is P21W (BA15s, UK 382); buycarparts Mk8 rear fog lamp units (Abakus/Alkar/Diederichs/Metzger) all spec P21W. Bumper-mounted lamp, drivers side.
Number plateW5WVerifiedStandard trims; LED plate lamps (not serviceable) on trims with camera-integrated plate lamp