Depending on your fabricatio ability you can use stuff from the auto industry. advanced auto has specs on thier website. Look into Volkswagon tie rods ends.
If you find yourself stump let us know and we'll help you out a bit more. We've already spent several hours researching this for the honda 400ex spindle. It will probably be the same for what your doing. I think the part number is a TRW419R but check it out.