ARC anti roll bar brackets are laser cut from 3/16" moly sheet. we have 2 brackets available that feature either 1 1/2" diameter or 1 5/8" diameter anti roll bar hole and 1/2" hole for the rod end. Centre to centre anti roll bar to rod end is 130mm (5 1/8") in either case. The 1 1/2" hole bracket is generally used with 1 1/2" s 0.120" wall tube, the 1 5/8" hole bracket is used with super duty 1 5/8" x 0.188" wall tube.