I just talked to a guy at Chuck's Trucks in Florida and he told me that the knuckles can be swapped from side to side to put the tie rod in the front, or the rear can be completely swung around but that will change the pumpkin location if it's and uncentered/un-narrowed axle. FYI, when they center or narrow one of the REO front axles they cut around 7" out of the driver's side housing, weld it back together and use then install a passenger side axleshaft in the driver's side.