Can anyone with an OE over the rail bed liner tell me how it attaches? I found a good deal on one and have to meet the guy in a parking lot 40 miles from my house and would like to know what tools I will need to get it out of his and in mine. I know the tail gate uses the screws, but I am not sure how the bed part attaches. Will I need to drill? or does it grab onto the underside of the bed rails?