I almost forgot, I was at KRC Performance just bs'ing (greatto live 3 miles from a Hemi Performance Shop) anyway, Marty had a brand new '07 Power Wagon for Long Tube Headers (among other performance mods), that's a 2500 truck w/Hemi. Drop him an email or call him to see what he used.
Although they are creative there, it wouldn't surprise me if they took a set for the 1500 and modified them there. Worth a call though. Tell him it's the Power Wagon that was there when I was in & asked him about.
http://www.krcperformance.com/krc/