Hi, I have replaced many bearings in all types of tools and high power industrial machines. I have obtained all of my bearings from bearing houses and not from companies whose tools I was repairing. The benefits are that they are usually less expensive and often you can choose a better bearing. The best thing to do is to find the bearing house in your area (search web or "yellow pages" if they still exist) and take the bearing with you. These houses know their bearings and will be very helpful. If you are in the Los Angeles Area, check out a bearing house on Canoga Park Blvd in Canoga Park. Enjoy.