Installed new 'classic style tow mirrors. My 2003 had the OEM accordion style, which even with NOT adjusting very often, had shimmy (loose) and adjustment motor burnout on at least 3 occasions. I got tired of repair, as it seemed a stop-gap situation, with a bad end-game. Installed aftermarket 2005-2006 style tow mirrors (GM/Ford-partially motorized style), which while not OEM, was much much cheaper than the newer OEM brand offering. While not perfect, they will do. Also did the serpentine belt replacement at 98,000, and yes that was about 20,000 miles late. Had used belt dressing for years, so that probably helped keep wear to a minimum. It was heat vs mileage (18 year old truck 98.000 miles) that was the deciding factor. I also have to start thinking about new brake pads, as I still have the original's installed. GM really did a good job on their 3/4 and 1 ton braking components, as over the years many have commented on the longevity (classic body style) for these trucks. I do not have any pulsing in the pedal (warp-age).
OLD STYLE........mirrors/ NEW STYLE.
Update: While not perfect, they will do. $140 a pair vs $500+ apiece OEM They are a better design, as Ford in 2003 and since, has used a similar design. Manuel extension vs motorized on the OEM, but I rarely will need that feature, and it will not take that long to adjust when towing is needed.