Welcome to MUD !! I just bought the full knuckle rebuild kit, with Koyo bearings, from Cruiser Outfitters. The Timken bearings are good too. They sell a high quality kit with all Japanese sourced parts. Bryce is also very knowledgeable.
If you are doing the knuckle rebuild yourself, the Otramm video is a detailed, step by step guide.
Welcome! Just to back up what has already been said, I use cruiser outfitters for most of all my parts. You have to call them to order parts. You can't order them online. They want to make sure they give you exactly what you need.
Otramm's videos are a life saver for new LC owners. I used the above video to do my first axle rebuild and recently used his video to do a entire head gasket repair.