This starter solenoid relay replacement is compatible with 550 and 700 series models and serves as a direct replacement for part numbers 3B4-81940-00-00, SMU6112, and 1S3-81940-00-00.Constructed from copper, it supports electrical conductivity and is rated for up to 105℃.The unit measures 2 cm in height, length, and width, allowing it to fit within standard engine compartments.Certified to meet applicable electrical and standards, this relay is designed for dependable performance in off-road and industrial applications.Includes basic installation guidance for proper fitment.