According to this thread..
http://www.scionlife.com/forums/showthread.php?t=30356

Part number is 90541-09080

I cant find this part number in dealership but i found it online,,its from lexus parts...so i assume toyota and lexus is the same company so they shares the same part #?

here it is:..

http://www.lexuspartsnow.com/parts/lexus-cushion~90541-09080.html

Should i order now!?

be the guinnea pig!! wish they showed an image of the thing. So it would just take two of them? Worth a shot, I might buy a couple of these, mine is a late '04 and it drives me crazy just about all the time!

wow subscribed very interested

Try this: http://m.scionlife.com/forums/showthread.php?t=33086

I actually spaced out the rear bump stops (the two on the body, not the hatch) with two oil filter washers on each screw and some silicone paste and I haven't put it to the test but initial impressions is that it helped quite a bit. You could use a rubber washer or the washer type o-ring from a hose. I really hope this at least improves the rattly as hell hatch of mine.