Here is a link to the towing mirrors we bought for our Tacoma.
http://www.1aauto.com/1A/Mirrors/Toyota/Tacoma/1AMRP01106/688914/2011http://www.1aauto.com/1A/Mirrors/Toyota/Tacoma/1AMRP01106/688914/2011
I have no affiliation with this place, but it seems they have a good selection, and they even had a video that showed how to install them.
Fred and Diane
2011 Toyota Tacoma
2014 R-Vision Trail-Lite Crossover 189QB