I am making a rear three point hitch ballast. I have a steel plate that measures 30 inches across and will need to mount the lower 3PH pins in from the edges of the steel plate so that I will stay I-Match compatible. Can someone give me the distance I need to allow for the I-Match lower hooks to clear the plate? How far away do I need to mount the pins from the steel plate? I plan on using two pieces of 5/16 angle iron 4 inches long that will be welded to the plate for the pin mounts.