These flat bottom link mounts are made to be welded directly to any flat surface. This is a super strong CNC bent, Laser cut bracket made to take serious abuse. Perfect for a three link or four link suspension system. These are made to be attached to any flat surface and have an inside width of 2 5/8" or 2" for heims with misalignment spacers installed. Like all of our products, they are made in the USA from USA steel.