I found out the hard way, too, on the recent KDX maintenance. The problem for me was that Motosport's on-line selection of parts fitting my bike profile included only the swing arm and linkage kits. So I never realized I needed the third kit until I had the old bearings in my hand. Since they don't have the shock kit for my bike, I never knew I needed it. I gues you & I are in the same category, apparently.