There are few dedicated "converters" because of the hash difference mentioned above. However, some file-sharing forums and databases index files by both hashes. You can try searching the directly on Google to see if a Magnet link has been cataloged for it on a metadata site like Aigle or specialized P2P forums. Why Convert?
The script checks public hash databases. If the file is known, it outputs a magnet link. Convert Ed2k To Magnet