Trying to install glass into door and am stuck with a problem. The vertical track which is mounted to the rear face of the door at the topmost held in with 1 surface mounted bolt and one recessed in the top pocket. The Osborn assembly manual shows a triangular piece mounted to the track identified as Rear Stop. The illustration has a blow up detail showing the drivers side (even though the main illustration is a passenger side). My question is, is there a rh and lh Rear Stop? When I disassembled this drivers door I only did one door at a time and this stop is opposite hand of what the illustration shows. Had the glass and vent widow frame all done but forgot this stop and had to completely disassemble. Your help is appreciated.