This is a NEW LH Undersized SPLINE type steering arm that fits IH tractors 766 through 5488. These also may be used on 826,1026 and late 56 tractors but the toe in will need to be adjusted because the splines are not indexed the same as the original IH arms. I cannot get the arms with the correct spline index for the those tractors but these arms will work. Please specify if your spindle has a square shoulder under the spline or a snap ring groove under the splines. This arm is .030 undersize spline and will fit original design spindle. This is the original design not the taper lock style. If your spindle splines are wore these arms will fit tight on the spindle splines. These WILL NOT fit on new spindles I also offer other front end parts in my store. I have over 25 yrs. experience of rebuilding IH tractors and motors and have many parts available . Email your questions and I can probably help you.