The Sierra 18-6506 Rewind Spring is constructed with precision and built with quality, marine-grade material. Designed to be interchangeable with the following: Mercury 24-29340T1, 24-29340A1, 24-29340T02, 24-23714, 24-20156, 24-45073A1, Mercury 29340A1. Each Sierra product meets or exceeds the original equipment part it replaces.