STILL TRYING TO FIND OUT WHY THE OLD VIGILANT I BOUGHT DOESN'T HAVE THE PRIMARY AIR PORTS ON THE FIREBACK. I HAVE SEEN A FEW PICTURES OF OTHER VIGILANTS OF THE SAME ERA AND THERE ARE FIVE AIR PORTS ALONG THE BACK WALL.THE VIGILANT I HAVE IS AN EARLY MODEL WITH THE SHORT DOORS, ANY INFORMATION WOULD BE APPRECIATED. THANKS