My trouble comes in the fact that my orignal box is leaking so I go to replace and there are two types. mine is the 2.5-3 turn lock to lock small input shaft. the other is 3.75-4.25 lock to lock with casting #5691676 and larger input shaft. I've gone to several places and they say they have both but all are the larger shaft even when labeled in box as the one i need. The one I need has 3 mounting holes all on the same plane i.e mounts right to the frame no spacers. Can anyone help me with this frustrating problem?