Manual steering box fitment question

easiest way to tell is the size of the hex nut at pitman arm. if you have a 1&1/8 socket to fit it, its early. If you need a 1&5/16 socket for it, its the later. I know this shaft and nut size changed on the power steering boxes but I'm not sure if or when it changed on the manual boxes. The center link attach to pitman and idler changed for both at 73 model whether that shaft size changed or not.