Sierra 18-2649 Power Trim Seal Kit The Sierra 18-2649 Power Trim Seal Kit is interchangeable with the following: GLM 87400, Mercruiser 25-87400A2. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra Power Trim Seal Kit Meets or exceeds the original equipment quality Sierra part number: 18-2649 Interchangeable with the following: GLM 87400, Mercruiser 25-87400A2