Find the part number, AN is a good source.
Do a Google search using the following format:
"part number AND Norton"
You should then get a listing of every such tool on the planet, and, yes some (plenty) off the mark responses. Purchase the quality that suits your needs. If you are going to use a tool for one engine you'll save a lot of money purchasing the "Harbor Freight" quality, if you are going to use the tool more often the move up in quality.
Best.