Do you need that little "u" shaped head thing that goes in the infant car seat? I can't find it! I bet it will show up sooner or later, but I don't remember if it's necessary!
Not trying to sound scary, but I know we all care about each others' LOs. I read a great article on car seat safety when C was little that advised against using rolled up receiving blankets because in a bad accident, the baby can move forward enough to allow the blanket to slip behind and cause a broken back. This is the reason that after-market products are not usually allowed by carseat makers. I'd think your best bet would to be to purchase a replacement piece from Graco.
Re: One more infant car seat Q...
I liked using it. The one that came in the carseat (graco) was a POS so I bought one at Wal-Mart for like 10 bucks and it looks so comfy.
ETA: Here is a picture using it. It's a 2 part system.
Well good to know that I can buy one if this one doesn't surface...
I have a feeling it's with the swing and the bouncer which are in the garage...