I have a 2006 - 2550 Silver Eagle with the same set up for the spindles! DC contracted a company in South America, I think Venezuela, to fill a shortage of spindles when these machines were made. To bad they didn't share that information with the owners of those machines. There are metric bearings and seals are avaliable at almost any good industrial bearing supply house.If not they can order either for you. There may be 3 set screws on the upper adjuster and they all have to be removed and the spindle shaft will unscrew from the adjuster plate. This is actually a better hub assembly since it is adjustable for bearing wear. Saw this discussion but had to start a new login and user account after several attempts to get a new password set up for my original account. I serviced both of the outer shafts and they have performed very well. After the first one is done it is easy to rebuild them in the future. .