I just lucked upon a Bush Hog D4-7. It is complete but somehow it has a S8-d with some weird carb in it. I would really like to locate a complete and running S7-d to get it more correct. I am not that familiar with Wisconsin Specs, so I am unsure if all S7-d's will work, or if there were some differences. I would even take a rebuildable one if it is complete.