This part is listed by BMW as BMW part number 51227465481 (51-22-7-465-481) and is described as Genuine BMW Support Shock (gas-pressurized spring) for driver or passenger door on I12 i8 Coupe and I15 i8 Spyder (2015-2021).
Fits left or right. Sold individually.
Supersedes obsolete BMW part number 51217404764 (51-21-7-404-764).
BMW Fitments:
i Series
I12 i8 (2015-2021) > i8 Coupe