At first I only purchased the lower spray arm hub, but later realized that the spray arm itself was damaged too. I added the spray arm bearing just in case it was missing or damaged. Although it didn’t appear to be a difficult repair I have multiple sclerosis and have difficulty kneeling so my son came over to do the repairs. He watched the video on the Appliance Parts Pros site and was able to complete the repairs in less than 15 minutes. The hardest part was getting the spray arm back on in the right position.