i was cleaning up a place for a elderly friend, and found what i had always thought was a jd 3 point sickle bar mower, i had seen this one run and mow.... about 10 or 12 years ago,then lost track of it, i have a use for one and i asked him what he wanted for it, he told me to take it he couldnt use it anymore, upon getting it unburried from in the barn, turns out it isnt a jd, its a ford 501, painted to go on a jd somewhere in its day. its all there, including the sway braces but they were given a quarter inch cut each to the webbing, he bought it like that,so i have no idea why it was done, the pitman arm is good, but probably,ly should be replaced due to age in the barn, and barn patina, cats, doves ect, im guessing the mower has a following based upon how many parts are available for it, now, it was running behind a 50 hp kubota when i saw it, it looks like i need to shorten up the top link to the last hole to make it sit straight up and down, i believe the 501 is made for the naa and newer tractor which is what i put it on, the driveshaft is too long, now i do have a orc on my pto, but if i take it off the shorten the pto on the tractor im back to the factory 1 and 1-8th pto shaft, the mower has the newer 1 and 3-8th shaft size on its coupler,what have you guys done to work around this? change the tractors shaft to the more modern size or use a solid conversion adapter, which is shorter, or shorten the mowers drive shaft, this thing is not the simple modern hollow 3 sided shaft, this thing has about a inch of solid steel bar stock, dont know if thats factory on it or not, i have no paperwork on it