As regards replacing the rubbers in the Centa unit, as long as you take it easy and don't lug the engine they will wear evenly and long. When my car was rebuilt due to the frame cracking my Centa unit had been in place for well over 20,000 miles. We replaced the rubbers and I kept the originals. They looked hardly worn at all. It really depends on how hard you drive. Again, lugging this beast will kill the Centa unit as well as possibly damage the motor itself.
