I have a Bestop instatrunk that I've been using in my LJ for the past 3 years. I don't think I'll use it again now that I have the hard top. When purchased new the top comes with some rivnuts to install in the walls of the cargo area to secure the trunk with. These are not re-usable, so you'll have to buy some to complete the install. I do have the bolts. I've also added a couple flush D-ring cargo anchors to the top to help with securing items to the box.