Based on this product's specifications, here are some alternatives and similar models
Security leash cable for SUP board Enero Universal — brand Enero, model 1019987
Summary description:
Enero security leash cable for SUP boards (Universal, model 1019987) is a protective tether designed to keep a stand-up paddleboard connected to the rider or anchoring point. It provides a durable connection using a steel cable construction with corrosion-resistant coatings and universal fittings for most SUP rails and D‑rings. Suitable for recreational paddling, rental fleets and safety-conscious users to prevent board loss in waves or currents.