I have a set of Yakima Q Towers and Q127 & Q128 clips with locks & 1 key.
This fits newer Tacoma's, single cab & DBL cabs you will need 58" cross bars for the roof.
Check the fit here http://www.nrsweb.com/yakima_racks/default.asp
Sold as a set only I won't break it and sell in parts.
Asking $100.00 + shipping New it sells for $229.00
These clips & towers fit other vehicles also you would need to look on Yakima's site to see what they will fit.