If I were you I would get two tin covers pull the PTOs off and carefully disassemble them mark all you pieces before you take them apart because they can be assemble in many different ways, as them same parts will make many different PTOs depending on how you put it together.
Clean all your parts and use a magnifying glass and record the numbers on the seals and bearings also measure the shim packs they will most likely be metal or plastic gasket like stuff used to set bearing preload. Then take the parts and your recorded info to a bearing supply house and they should be able to set you up with seals, bearings, shim stock, and any knowledge about shimming the bearings you may need to rebuild you PTOs.
