This is a NEW RH SPLINE type steering arm that fits IH tractors 766 through 5488. Right Hand side These also may be used on late 656,late 756 ,late 856 826,1026 and 1456 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 other than through CASEIH for around $350 ea. but these arms will work.This arm is STANDARD size spline and will fit original design spindle. This is the original design not the taper lock style. If your spindle splines are wore , I offer .030 undersized arms in my store. 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.