Firstly, check the existing alternator drive belt’s code markings to ensure that you buy the correct replacement. Also be aware that early mk1s had V-belts whilst later versions featured multi-grooved belts: the fitting procedure is just the same. You’ll be working in the depths of the engine bay amidst rotating parts, so ensure the ignition is off and the key is out of the ignition. Before starting work, wait until the engine has cooled down, as your hands and arms will be rubbing up against the radiator and cooling pipes. You don’t need many tools – a Philip’s head screwdriver, 12mm and 14mm spanners, long-nosed pliers, oil can with a long spout, and a good torch: it’s dark in there. Thanks: Michael Cleverley of Cleverley Repaired Cars.