This is Such a Great Question.
I sincerely appreciate you asking this. I too had difficulties for a while finding a reputable source for parts for my '97 Ford F250 that were not remanufacutered parts or in poor condition. Finding the right auto part for your diesel truck, let alone at the lowest pricem is quite a challenge. I tired a few places online, but typically wound up returning everything i bought since it did not fit or was in bad condition. However, I have had great success dealing with WCP Diesel. These guys know their stuff. I think they could help you find what you are looking for.
Best of Luck!
www.wcpdiesel.com