These black blanking plugs or blind grommets are suitable for use on metal panels with a 2mm thickness. The plug is identical to Nissan part 80874-AX000 which is normally used for filling access holes in the vehicle doors and the firewall / bulkhead. The parts are suitable for an 18mm hole.
Please check the details carefully before you order. Every vehicle has many different clips and fasteners. Even if the ebay compatibility check says these are used on your vehicle, that does not mean that they are the only clip and will be the ones that you need. It is important to check the photo, part number and dimensions before you order.