| The smaller bearing is a 1" bore agricultural bearing, the larger bearing is a 8"or 9" Ford wheel bearing. My cost for both new was $21 USD. Any similar bearings can be used, adjust dimensions accordingly.
The washer in the middle with two holes is used to retain the upper bearing. Holes are drilled to match your frame. Shims can be installed behind the bearing to square it if needed.
The washers at the bottom are to adjust the position of the bottom bearing. Click the image for a larger view. | 
