Kevin here are some pictures that may help .i have 2 yokes that look the same no step .the bushings themselves have a ridge that are the same on all three that I have.The brass bushings are not all the same one ,the older stlyle 47to 50 will not fit the yoke the other two are for 51/54 the two newer style are from different places and look a little bit different and one is tighter fit and won’t go in as far.