"SECURING ARM OFFSET 2.781 IN,SECURING HOLE IS 90 DEG TO MOUNTING HOLE; BORE LENGTH: 3.375 IN. NOMINAL; FORK WIDTH: 5.125 IN. NOMINAL; SECURING HOLE SIZE: 0.531 IN. NOMINAL; DISTANCE FROM MOUNTING FACILITY CENTERLINE TO ARCH CENTERLINE: 4.531 IN. NOMINAL; ARCH INSIDE RADIUS: 2.563 IN. NOMINAL"