I don't know what your looking for as far as towing mirrors.
As far as clip ons I have had good and bad even from the same mfgr.
Your best bet is to go OE style telescoping mirrors. Might get a little pricey though.
Here is a good read from our friends over at f150online.
Note:
These threads contain the following info.
How to remove old and install new.
Where to buy.
Approxiamate pricing.
Some wiring diagrams found in user's albums.
http://www.f150online.com/forums/200...ml#post3738699
There are additional threads within this one also. Enjoy!
Lars