On both the OE pump from our RT and the new one just out to check the rod, 1-5/8" from flange face to tip and 1-1/2" to wear witness mark.
Hope this helps, Joe
PS measurements on Comp Cams pump rods: Comp's #4646, with tip for roller cam, 3.211" (new in package) Comp's #4626, out of Engine w/knock, showing acceptable tip wear, 3.222"