Mick, they are what is known in the Trailer Industry as "Parallel" Bearings, rated at 1600Kg. The inner and outer bearings are the same items, being 68110/49 (2x per Hub, 4x per Axle, 8x per PT2-2). If you're in an out of the way location and not near a specialist bearing supplier, no probs, as these bearings are the inner bearing in Ford or "Slimline" sets and are available from Supercheap, Repco, etc and even many service stations. The grease seal is also the same one used in the Slimline set.