My 9400 needs a set of rasp bars. Looking in various parts catalogs there are bars with one row of fastening bolts and bars with two rows of fastening bolts. My machine currently has the two row bars in it. Question is I've found in internet searches that they are interchangeable and to go with the one row bars because they are easier to install. According to the Deere parts book the single bolt row bars are used with the high inertia cylinder. I do not have that cylinder and there are no notes that they can be used in place of the two row bars. So does anyone know the answer to this before I go bother the dealerships combine guru?