Well here in the states the OEm hood insulation only comes with the 3.5L engine.
The insulation is a moulded piece (some sort of moulded fiber and sound deafening material) with a metallic finish on one side (the side facing the engine). Its flexible about 1/4 inch thick (7 mm) It attaches to the hood with 14 pins. All Santa Fe hoods have the 14 holes that the insulation will fit into. It isn't cheap, its about $175.00 USD here in the states, so I do not know how much it would be for Greece. You will need to get the 14 push pins as well and those are about $10.00 US.
The part number for the OEM hood insulation is 81125-26002 see pic below.
Its a one piece item..
As you can see it has the opening for labels that are on the hood to be seen.
These are the push pins needed to attach the insulation to the hood. (81126-37010 and 81126-37014)
Final view attached to the hood.
Another hood insualtion attached view.
TS out