When doing replacement or upgrading on 2015 – 2018 Lexus RC350 F RC RC200t RC300 Turbo, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.

Back Up Light 2015 – 2018 921
Front Turn Signal 2015 – 2018 7444NA
Parking Light 2015 – 2018 7443NA
Rear Turn Signal 2015 – 2018 7440NA
Interior Door 2015 – 2018 194
Stepwell 2015 – 2018 194
Trunk 2015 – 2018 168
Back Up Light 2017 921
Front Turn Signal 2017 7444NA
Parking Light 2017 7443NA
Rear Turn Signal 2017 7440NA
Interior Door 2017 194
Stepwell 2017 194
Trunk 2017 168
Back Up Light 2016 921
Front Turn Signal 2016 7444NA
Parking Light 2016 7443NA
Rear Turn Signal 2016 7440NA
Interior Door 2016 194
Stepwell 2016 194
Trunk 2016 168
Back Up Light 2016 – 2018 921
Front Turn Signal 2016 – 2018 7444NA
Parking Light 2016 – 2018 7443NA
Rear Turn Signal 2016 – 2018 7440NA
Interior Door 2016 – 2018 194
Stepwell 2016 – 2018 194
Trunk 2016 – 2018 168
Back Up Light 2015 – 2018 921
Front Turn Signal 2015 – 2018 7444NA
Parking Light 2015 – 2018 7443NA
Rear Turn Signal 2015 – 2018 7440NA
Interior Door 2015 – 2018 194
Stepwell 2015 – 2018 194
Trunk 2015 – 2018 168