Originally Posted by Fox hunt
It's a 2003 short bed super duty F250 and really the mirrors don't extend would have been a nice feature I but I bought it used.
I checked the manual, and indeed the telescoping feature is noted as optional, with two entirely different shapes of mirror shown. So I checked four online suppliers of OEM-style replacement mirrors, and they all show three styles... only one of them telescoping.
2003 Ford F-250 Mirrors at CARiD.com
Fit System Replacement Mirrors, K Source Side View Mirror
Amazon.com: Exterior Mirrors - Body: Automotive: Left, Right, Automotive Outside Mirrors & More
It is not unusual for two quite different styles of mirror to be available for the same vehicle, and usually they mount to the door in the same way (for ease of design and manufacturing), so they can be interchanged. In this case, it looks like one of the non-telescoping designs has the same mounting base shape as the telescoping design, so it may be possible to upgrade and gain the ability to extend the mirrors. Since the switches and wiring would not likely be in place to operate powered features which the truck didn't have when it left the factory (marker lights, turn signals, heated glass, power extend), but the extension is manual (no power extend in 2003 for this model).
It may seem silly to remove perfectly good factory-installed mirrors, but OEM-style replacement mirrors are reasonably priced, and the originals could always be reinstalled later if desired.