This depicts hardware necessary for installation of kits for creating a soil aerator from a custom frame. The picture above is the mounting kit for the 3" x 5" x 3/8" swingarm.
Definitions rf / lr = Right Front / Left Rear - This hanger would be used on the right front or left rear lf / rr = Left Front / Right Rear - This hanger would be used on the left front or right rear