I realize it's an old thread, but it was pretty much the only one that came up when I searched prior to removing my factory rack.
The dealership where I bought my LC couldn't figure out the parts required to remove the rack. Apparently, a parts search doesn't show all the parts...
Anyway, if you want to remove the rack you will need the following parts (which I sourced thru Beano):
6 x Cover, Roof Drip Moulding
(P/N: 75596-0E040)
6 x Bracket Roof Rack
(P/N: 63185-0R010)
12 x Bolt, w/Washer*
(P/N: 90119-08C47)
View attachment 1041929 View attachment 1041930
* you don't really need these, but my thinking was that I didn't need the beefier bolts from the rack to hold the covers on...