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 Light2015 – 2018 921
Front Turn Signal2015 – 2018 7444NA
Parking Light2015 – 2018 7443NA
Rear Turn Signal2015 – 2018 7440NA
Interior Door2015 – 2018 194
Stepwell2015 – 2018 194
Trunk2015 – 2018 168
Back Up Light2017 921
Front Turn Signal2017 7444NA
Parking Light2017 7443NA
Rear Turn Signal2017 7440NA
Interior Door2017 194
Stepwell2017 194
Trunk2017 168
Back Up Light2016 921
Front Turn Signal2016 7444NA
Parking Light2016 7443NA
Rear Turn Signal2016 7440NA
Interior Door2016 194
Stepwell2016 194
Trunk2016 168
Back Up Light2016 – 2018 921
Front Turn Signal2016 – 2018 7444NA
Parking Light2016 – 2018 7443NA
Rear Turn Signal2016 – 2018 7440NA
Interior Door2016 – 2018 194
Stepwell2016 – 2018 194
Trunk2016 – 2018 168
Back Up Light2015 – 2018 921
Front Turn Signal2015 – 2018 7444NA
Parking Light2015 – 2018 7443NA
Rear Turn Signal2015 – 2018 7440NA
Interior Door2015 – 2018 194
Stepwell2015 – 2018 194
Trunk2015 – 2018 168