Back hatch is rattling and it appears that of the rubber things is not there.

Anyone know the part number.

I don't really understand what it is you are asking for, but this may get you in the correct area "Tech","xB, "microfiche. Hope this helps.
http://www.scionlife.com/tech/parts/image.php?image=xb04_2_K05.gif or this one: http://www.scionlife.com/tech/parts/image.php?image=xb04_2_I05.gif

Sorry.

There are 2 rubber pieces that are attached to body (not the door).

One appears to not be there, so the back lift rattles.

Thanks!

I can't access this area since yesterday.

Sounds like you're talking about the rubber "bumpers" which support the bottom part of the tailgate when closed.

Whatever part you need all you have to do is to go to (or call) your local Scion dealer parts dept. and tell them what you're looking for. They can look it up on their fancy computerized parts diagram. Since they already looked it up for you, might as well order them from the dealer as I doubt you'll find those bumpers anywhere else.