If you get a manual, it will tell you all the sizes of the seals and bearings. And there is a very good chance they are all still available, but you might have to order from a bearing supplier and seal supplier. And those prices are usually less than what a dealer might charge you. Don't know about the shock, but most of the mid-70 mx bikes rear shocks were rebuildable, even if they weren't suppose to be. Might require brazing on a valve when they are rebuilt, though.