where the roof rails sit. if you take them out, or the stock metal piece that is there now, it looks like this:




now, that picture does have some left over epoxy in the channels from me not really cleaning them out, but you get the idea. when you pull the roof rails out you need to put the stock channeling back, but normally when you pull them off you bend them and ruin them. therefore you need to buy them new from a dealer and im not sure if you can get them anymore.