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I would think you could find those at a local junkyard/pick-a-part place near you. Our cars are so old they probably wouldn't be available at a dealer but it wouldn't hurt to stop by one and ask.
Late coming back. I found the foam thing at a Pull a Part off an 2003 G35 Sedan... fit my 05 coupe just fine. Couldn't open the trunk, so I couldn't see if the trunk bump stoppers matched. Of course the hood was gone.