I recently purchased a Transformers Final Battle Optimus Prime bust by Diamond Select. I really like the piece, but when I opened it up, I realized that it is missing one of the small round foam/rubber pads on the base. There is no residue, it looks like one of the pads was skipped at the factory. It is not level, and I worry that it might end up getting scraped or scraping my shelf. I have looked at several hardware stores but can't find anything the right size. Has anyone had to replace these on a statue or bust, and know where to get them?