I have a 2018 Explorer and so far on the roof rack is a cheap plastic insert into an 8 mm hex bolt. The hex bolt doesn't seem to unscrew or do anything when I try to turn it. My issue is that Ford put on a roof rack that is solid on the sides so that I can't tie anything to it. I put kayaks on the roof and since it is a solid side, that makes tie down very challenging. Any ideas or roof products that would help me stabilize two kayaks on the roof? I was hoping to remove the rack sides to see if it was a filler piece of plastic more for cosmetic look. Thanks.