The Part: Door Inner Panel / Shell
The part number 9070862151 refers to the main structural inner frame of the door, also commonly called the door inner panel or door shell.
What it is: This is the large, single-piece molding that forms the foundation of the door. It's made from a lightweight carbon fibre composite, which is a key factor in the 4C's low weight.
What it is NOT: This part number is not for the complete door assembly. The complete door includes this shell plus many other components that are purchased separately.
Key Details:
Side: This specific part number (9070862151) is for the LEFT-HAND (passenger side) door.
Left Side: The equivalent part for the RIGHT-HAND (driver side) door is 9070862141.
Finish: It comes as a primed (white/grey-ish) bare shell, ready to be painted the body color of the vehicle.
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Material: Carbon Fibre Composite (This makes it very strong and very expensive).
What's Included (and What's Not)
This part is just the shell. You will need to transfer EVERY component from your old damaged door to this new shell, including:
Door exterior latch and mechanism
Window regulator and motor
Door handle (interior and exterior)
Speaker and wiring harness
Door lock actuator
Mirror and its mounting base
All seals, clips, and fasteners
The exterior door skin/panel is a separate part that gets bonded to this shell.
Why is it so expensive?
Replacing an Alfa Romeo 4C door is notoriously costly for two reasons:
Material: The carbon fibre construction is exotic and expensive to produce.
Labor: Transferring all components from one shell to another is an extremely time-intensive and delicate process, best left to professionals with specific experience.