Doug's Headers:
http://www.jegs.com/p/Dougs-Headers/Dougs-Headers-for-Dodge-Plymouth-Passenger-Cars/763754/10002/-1

TTI's headers:
http://www.ttiexhaust.com/Category-ClassicHeaders/340-Step/TTi340.htm

Same flange thickness (3/8") and tube thickness (16-guage). TTI's are stepped and cost a little more.