Hi all ,As the title says, I can see that some models mirrors are electrically folding while the majority aren't.I also saw that those that have the feature must also have a folding switch next to the selector switch.I wonder how much to retrofit this feature to the non-electrically operated folding mechanism?Maybe buy used parts for sure need to buy new switch but how abt the mirrors itself. Is the motor already fitted just awaiting for plug and play?All kind advise highy appreciated.Cheers