Review on MOTOOS Towing Mirrors: Power Heated Telescoping Tow Mirrors with LED Signal Turn Light, Replacement for 1999-2007 Ford F250 F350 F450 F550 Super Duty (Pair Set Side Mirrors) by Tony Suggs

I read reviews that they vibrate at speed. This set is factory. They come with adapters for square or round plugs. It would be helpful to have a helper hold the mirror while you start gathering nuts. I used my old nuts as they have a built in washer and seem to be of better quality. The squishy foam padding on the new mirrors holds them in place just enough to make getting the nuts a little difficult. Just push down enough to tighten the next one, then go around and tighten them all. You can feel the foam on the door as you go.