I am working on the hood of my 640 and can't determine for sure what exactly is supposed to hold the grille to the hood. I have hood halves from different tractors and on the one side, there was a cupped washer with some deteriorated rubber in the cupped portion. This was stuck to the shouldered stud at the bottom attachment point. I looked at the exploded view on the New Holland website and it is not shown clearly. I also don't see any similar parts on the aftermarket websites. What is exactly supposed to be down there? I am assuming it's held on with a 5/16" fine threaded nut but not sure if its a plain or washered nut and what all goes between it. Not caring so much about originality as I am rattles. Also, I see that there are 4 rubber strips that staple to the side of the grille that go between the grille and the hood sides. My grille had the remains of them. I also see there is another rubber piece that goes to the grille, but I don't know where it goes. Thanks.