The bigger, "U" shaped bracket is for mounting a lawn-vac system to the back of the tractor. If you measure the distance between the narrow placed tabs sticking out on this bracket, you will find that they are almost the same distance apart as the front frame mounting tabs on your round fender. Not sure what the smaller bracket is for.In the third picture we had this bracket that came with it. We are pretty sure it does not belong. We studied the parts list and pictures but it was not on there. The color was different too.