Guys - All AD cabs have top cowl mounted vents. The 54-55 1st are shaped different becuase of the new one piece windshield. The Side cowl vents were eliminated in '51 with the advent of the new door mounted vent windows. I agree with everybody on the body mounts. One thing that a lot of guys don't know is that the firewalls are slightly different thru some of the AD years. The firewall on the '47-'48 are the same. '49 is different with a rain trought added on the top of the firewall, '50-'55 1st have the rain trought plus added embossed strips on the firewall for added rigidity to the firewall.
