Thanks c2one. unfortunately, those don't seem to fit. the link you sent is an awesome price for them though. anyway...i have the same parts in hand and they do not fit in the side rails. when i went back to the seller, he highlighted the "mount in the cross bars" note in his listing. it's really weird b/c in both of my previous T4Rs, i have never needed hooks on the crossbars, only on the sides. not sure why they would make them for crossbars. i have seen the same part listed for the tundra bed rails. in the tundra picture i saw, it showed a wider track opening than the roof side rails which makes sense for the part i'm looking at. If you have installed these, and think i might be doing something wrong on the install, please let me know. thank you.This link is for reference:
Genuine Toyota Roof Rack Tie Downs for 2010-2013 4Runner-Set of 4-New, OEM:Amazon:Automotive
This link is for purchase:
Toyota Parts - Camelback Toyota Parts - Genuine OEM Parts - Free Shipping