Set of 4. BHM1137, the latest and greatest. Stronger than "S" and fits late model cranks. The late model Mini and Austin America 1275cc engines have larger (1.75") rod journals than the original S. These are considered stronger and thus better. The problem is that the std pre-A+ rods are very heavy (750 grams). These BHM1137 con rods are a NEW set and at 650 grams are lighter than the original S (690 grams).There will not be anymore once sold
