TTI headers (tube technologies inc). They build headers and exhaust strictly for Mopars. They are pricy but fit is exact and you can get a wrench / socket on every header bolt. I Put their ceramic coated long tube headers and H pipe on my 67 340 dart and the fit is awesome - no leaks and they are built right. You can go to their site tti exhaust.com or check out Schumacher creative services - they make Mopar headers as well. I've used both places.