Kubota Grand L 5740, loaded R1's w/640 lbs cast weight, 854 loader
call scott at 717-896-3414. He is a new holland dealer in Halifax pa and they have some NOS plow parts.
I bought a few parts from them for my 102. it's a 101 with a mirror image.
just get yer pocket book ready.
I doubt that he will have all the parts and I had to build a fork clamp and the rod for mine but I did get the hub and two disks
Ken at Sweet Tractors may have some of what you need.
I know that a john deere planter disk will work for the actual coulter after you have the hole in the middle opened up a bit.
You can go to the New Holland web site north america and look for parts and you can find a breakdown of the plow with part numbers. If you want, I can talk you through the website to get you where you need to be.