We just got a new SL 400 and wanted to remove the lower tower racks. We took them off easy enough but it left a nasty hole in the nice black tower. I contacts Skies Choice but they said plugs are only available for the top racks (because the lower ones are standard...dumb reason. I went ahead and created a plug than can be 3d printed and I figured I would share. Its a tight fit...ended up sanding it down a little but looks great once installed.