Why are the motor mounts different for the 3.0 400 stringer? The 2.5, 3.8, 5.0 and 5.7 use a rubber mount and the 3.0 uses a different metal rubber combination. I have a 3.0 and one of the mounts is broken and you CAN'T find new ones. I also have mounts for a 3.8, can I USE THE 3.8 MOUNTS ON A...