Replace the 3-point harness for the back seat of your BravoFor2 Standing/Sitting Double Stroller.CompatibilityCompatible with all BravoFor2 models:XXX79780XXXXXXXXX79135XXXXXXXXX79781XXXXXXXXX79574XXXXXXFor questions or help with assembly, please refer to the product manual or contact Chicco customer service at 1-877-424-4226.