Headliner rear fastener and rear window rattle.

[1N4ttro]

Hey guys, my rear window rattles at times so while investigating I noticed that both rear corner fasteners are missing (red arrow). Looks like a fastener/pin holds the rear corner of the headliner in place but could not find it at realoem and the dealer did not know what I was talking about over the phone and asked me to swing by. I would prefer to order this online, does anyone know the part number or what this is called? Now to the rattle on my rear window, I noticed that the bottom of the window rattles because it makes contact with the square looking piece inside the yellow oval marking. Is there supposed to be a piece that is missing and I don't know about underneath the rear window? Don't have access to another vert to compare. Thanks.