Parts are assembled, Tig welded, and honed to size. Axle fabricator needs only to alter the length of the axle tube and drill holes for plug weld, slip ends into tube, set to desired caster angle and weld. No further machining required. They are available in standard boss or for the camber sleeve boss. With the addition of the camber sleeve kit you have the ability to change camber +/- 1.5 degrees in half degree increments so that is a total of 3 degrees of adjustment. Available for a variety of aplications contact us to find out how we can help you. These are now standard part for the Next Generation Silver Crown Car!!