The J is the Astra built 2009–2015. The registration's age identifier is the quickest check: 09 to 65 plate. The V5C gives the first-registration date, and this generation's fitments apply from the first 2009 cars onwards up to the 2015 run-out.
Front indicatorPSY24WVerifiedOften listed as PY21W elsewhere — headlamp-integrated amber indicator per owners club lists; TecDoc catalogues list PY21W
Rear indicatorW16WVerifiedvxoc/diagnostics lists and onlinecarparts (Bosch W16W 'Rear') agree on W16W; cluster has amber lens so clear bulb is right. birnen-typ WY21W treated as outlier. UK code 955. GTC/estate not separately confirmed.
Brake / tailP21/5WVerifiedMost-listed; W21/5W wedge on some cluster designs
ReverseH21WVerifiedOften listed as P21W elsewhere — BAY9s single filament (435)
Rear fogH21WVerifiedOften listed as P21W elsewhere — BAY9s (435)