| There are only 4 nuts that hold this piece on the car, 2 are 8mm and 2 are 10 mm. they are pretty obvious and shouldn't be a problem to find. The smaller ones are located in the square cutout areas on the underside of the hood.
Or you could do like I did and drive around for 3 months, wash the car one day and find the whole thing loose, open the bonnet and see that 2 nuts had fallen off and the other 2 were almost there.
As for which one is best, I've seen neither so I can't help you there.
Good luck | 
