Help!

I just washed and put together our Graco infant car seat, but I have this piece and I don't know what it is for...it looks like a headrest, but there is another one I used before and the one pictured here isn't on the pictures online. I also have two shades. I have the matching stroller and pack n' play with bassinet. Any ideas on where this headrest goes? Or the second shade?
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