Hy Grigg, TRW p/n ES142-L taper is from .874" to.783" from the end of the thread to the centerline of the stud is 3.88", and the thread is 1" X 16 L.H. the dimensions on ES142-R are the same except the thread is 1" X 16 R.H.. The ones I thought they might be are ES73-L and ES73-R, their dimensions are, taper .773 to .680 from the end of the thread to the centerline of the stud is 3.75", and the thread is 7/8" X 18 left and right hand, I hope that helps.