In case anyone was thinking about buying a set of these, here's what I found. I bought a set of the Chinese made cross bars from Amazon because I couldn't see spending $600+ at the stealership. The covers don't sit 100% flush with the base, but I expected that. They do lock and have a key, so I don't think the covers are going to blow off. The biggest problem I found was when you locked them down in one of the roof runner notches, they were extremely loose. I bought eight 5/16" X 1-1/4" nylon washers (two for each latch). Then pulled the latch assembly apart by pushing out the pin holding the handle to the latch, pull the spring off the latch, place two washers on, replace spring and reinstall handle.
Now they lock into the grooves very snug, cost me $2.50 and took about 10 minutes.

 

Good job.
It's refreshing to hear of a nice DIY fix of an issue instead of hearing a wineyass rant on how something doesn't fit.
Improvise, adapt and overcome

 

Been running these for several years. They hold up just as well as the OEM's and the covers haven't come off.
Mine were a tiny bit loose depending on where at in the track I tried to latch them down. I just pushed down on one side of the rail a tiny bit where I wanted them to sit to create some tension and haven't had an issue.

 

Do you have any pics??

 

Unfortunately no. But, it's not too hard to figure it out when you see how the latch mechanism works.