Yes, rails. The mounts cannot go any lower. im using the regular aeromarine engine mounts. when i attach them to the motor the way their supposed to be the motor sits way too high in my opinion. Since the motor is oversized for the hull it makes the shaft angle worse and also makes it seem top heavy. If i set the motor underneath the engine mounts i can get it nice and low in the hull and have little bend in the shaft. Looking at it i do not see any problems but i was just wondering if their are any downsides to this besides the throttle linkage.