Not sure of the size, but they are platinum and pricey!!
follow the spark plug wires from the engine and where they connect is your coils
Under the cover where the spark plug wires go into on top of the engine.
To find the air bag plug under the seat, look for a yellow plug on a 2002 Hyundai Sonata. Re-connect the yellow plug to the yellow plug receptacle. There should also be an orange strap that keeps the plug from separating. If that is broken, it will need to be replaced.
hyundai getz 1.1 spark plug gap
We need to know which engine you have to be helpfull
The spark plug gap for a 2005 Hyundai Accent, according to spark plug manufacturers, is .044" (1.11mm)
Pop round to the local auto super mart. In the spark plug aisle you will find manufacturers catalogues for what plug in which vehicle and look yours up. Or ask the friendly assistant.
sonata 2.0t is denso zxu20hcr8
You will need a 5/8 socket.
The spark plug gap for a Hyundai Amica should be set between 1.0 and 1.1 mm. A new spark plug does not need adjusting as it comes preset from the factory.
A Hyundai Matrix should have a spark plug gap between .039 and .043 inches. A new spark plug may be purchased preset from an auto parts store.
The spark plug gap for a 2000 Hyundai Elantra should be set at .044 inches. New spark plugs will be preset at the factory.