I just picked up a 3pt 3bottom plow this weekend. It won't fit my 1650. The balls that fit in the end of the lift arms partially cover the holes on the plow pins. I also have to grind down part of the mount on the top so the toplink will fit. Are there different size balls to fit in the lift arms or am I going to have to grind away part of the shoulder on the balls to make them fit? 
Also, how can I identify the plow? I can see Oliver Raydex on the bottoms but can't see any other markings on the plow. I need a coulter as well if anyone knows of any.
Thanks for the help.