[hrc200x]

If its the one below the rear window that wraps around the side of the cab you reach up on the inside of the cab behind the seat there will be a hole above the cab corner, somewhere up there past your wrist but before your elbow you'll feel one of those speed nuts, can't recall the size, maybe around 3/8" or 10mm, loosen that then the cab corner piece will slide out of the long piece below the window. I've always slid the long piece all the way out the side to get it off and same for reassembly slide it all the way back on. But maybe those plastic clips do have some spring to them you can just push down on it to release the bottom.