This bracket is for a Squared edge mounting position, Frame Rail, Boxed Truss, Crossmember, anyway, lots of uses. This Bracket is easily adjusted 5 degrees either way with minimal grindage. Made with the very common 2.625" (2 5/8) inner width. These are .25 HR P&O Steel Plate with an integral Bridge bent into the Bracket so you have no weld related stress risers to worry about. Drilled for .5625" (9/16) bolts but easily drilled to another size. Sold as Left and Right pairs.