They just screw onto the fender. The ground wire is on the stud that holds fender to trailer. About 10 minute job per side. Make sure you have a new connector for the ground. Very simple job. I just did mine. Good Luck pant 2 Bob I also used liquid tape on the connection.Last edited by pant 2 on July 16th, 2009, 12:04 pm, edited 1 time in total.