If you've actually wanted a Tonneau Cover for your GX but have had problems trying to find one from the Dealer or online I found an easy fix. The two pics below are from both my new GX and a Land Cruiser from a Youtube Video. Exact set up. My Dealer's Parts Manager said I'd need to spend $4k to rebuild my interior....it's actually $150 from Toyota and that includes the two small bolt covers once you remove the side wall cover. The Toyota Part Number is 64009-60010-C0. The YouTube link is Start watching at 5:45. I'm still looking for a cover in the SO Cal area if anyone has one or I'll buy from Toyota this week.