The OE parts inside the fuel filler neck are plastic and prone to failure. These parts are direct replacements 3D printed in aluminium. Please note that this is a fairly tricky repair procedure.The fuel filler neck assembly must be removed from the car. It also relies on reusing the rubber seal, spring and pivot pin so if you've lost these parts or they are broken this won't be a complete fix.
If you're unsure then send us a message and we'll do our best to help.