I picked up an older, but unused TrepTop NX for my '04 TJ. Inside the aft corners, where the plastic corner support piece slides in, I found an 18 inch (approx) fabric tube (sewn but open on both ends) which is made with same material as the actual top. It was doubled over and slid inside of the corner piece. I have no idea what the purpose of this is...anyone? No mention of it from the TrekTop website / instruction pdf etc.