Sierra 18-2097 U-Joint Permalube The Sierra 18-2097 U-Joint Permalube is interchangeable with the following: GLM 28040, Mallory 9-72406, Mercruiser 805536A1, 8055361, 805536A2. Each Sierra product meets or exceeds the original equipment part it replaces. Sierra U-Joint Permalube Meets or exceeds the original equipment quality Sierra part number: 18-2097 Interchangeable with the following: GLM 28040, Mallory 9-72406, Mercruiser 805536A1, 8055361, 805536A2