I decided to take my 06 Nismo's roof rack off around 2 months ago, because it was leaking water through the bolt holes whenever there's constant rain for a day or two. I ended up liking how it looked without the racks, so I decided I'd leave them off and figure out how to seal the roof rack holes that apparently run straight into the headliner. I figured putting these perfectly sized plastic pieces that I found over the holes and sealing it with some sort of clear sealant would work well enough, but nope. If we get extended periods of rain there's still water that comes into the headliner and leaks all over the front of the truck. I'm trying to figure out what the best solution would be. I would prefer a solution that's not too permanent because I may decide to put the rack back on one day, though I don't mind if I have to use sealants or whatever. Any help would be greatly appreciated. I wasn't able to find much information on this subject anywhere online, so hopefully this will help others in the future also.