I have a 912ULS with ignition issue on ignition A. It runs rough. The ignition modules have been tested by Lockwood and are fine. The resistance on coils checked.It has been traced to probable spark plug connector not seated correctly and the pin damage by arcing. Lockwood lists two connectors under the part #265 240 & 265 268. The 265 268 is twenty dollars more. Anyone know the difference?