Pedido de parafuso de Colata

Hello friends of this forum ... Well, as you know for a bug, my machine was formatted and I lost all the information that I had in it ... including the manual of my Nissan Sentra 1984 of the B11 series ... and well this manual is not available on the network so I turn to you to ask you if anyone knows how the screws that squeeze their heads, since as you know they come in 3 sizes and then I need to know where I Each one goes ... so I will appreciate any help ... greetings ...