It is originally fitted between gearbox carrier and body, but a better solution is to fit one between a bolt between engine/gearbox and the body of the car, because by doing so one avoids the oil that is always dripping down from the gearbox and this causes bad earth.
Hi, starter too slow to turn engine. New battery and leads, starter & solenoid OK. Think it may be an earth problem? Where should the earth lead be fitted to engine? At the moment its bolted to the timing case - should it be more directly connected to the block??