Eazy, 1stly get the bearings from a bearing seals and belt place, not Brammer bearings they are expensive, most little independents give the best prices usually a fraction of motor factor prices, the bearings will have ID markings E.G SKF 6302 marked on them failing that take them out 1st and take them to the bearing place. replacing the bearings is simple I take the hubs out give them a good clean and then warm the hubs in the oven (hence clean 1st) this causes the metal to expand, squirt some freeze spray on the bearings while its all hot and they will shrink and drop out or push a frozen sausage in it same effect, better than braying them out as sometimes they can twist and damage the housing the bearing sits in avoid heavy hammering and keep them square on the way out. To replace I put the bearings in the freezer and the hub in the oven, they usually just drop in or only need a tap, make sure they are seated correctly in the housing allow to cool and them push in the seals use a large socket and press them in in a vice ensuring they don't snag on the outside use the backface of the socket to push it in square and even, Hot and cold simple
