I have always had a professional trailer guy do the maintenance on my trailer. I take it in every spring for a general inspection. (Gives me a reason to put the boat in the water at the local marina for a week of live-aboard pretending that I am in a nice warm place/ Brrr!) But if you want to do the work yourself, of if you want to help out your freindly professional brake guy, here are the essential part numbers: 1) Brake shoes. Can be replaced with Bendix show #R154 -- available at NAPA or most other auto parts stores. 2) Oil Seal -- 470361 3) Inner Bearing -- 68149 4) Inner Bearing Race -- 68111 5) Outer Bearing -- 44649 6) Outer Bearing Race -- 44610 7) Spindle Inner Dia -- 1 7/8 in 8) Spindle Outer Dia -- 1 1/16 in