Drew, the Pitman arm that I got is for a '67, V8, with power steering. The outside diameter of the shaft is approx 1.180". I am a little confused because all the aftermarket steering boxes refer to a 3/4" diameter (which is what I have now) or 13/16" diameter. Do you have a steering box that is quick ratio for power steering, with the diameter shaft I need to accomodate the Pitman arm that I have? Again, I need this Pitman arm to clear the headers. Give me your email address so we can communicate. Mine is voxman57@optonline.net. Mike. If anyone else can explain which applications used which Pitman arms and output shaft diameters in '67, it would be greatly appreciated.