They are called bellowed up pipes, you order directly from a International Truck dealer. They used them stock at the Medium Duty trucks that have the 7.3 They are pricey but worth every penny, no more leaks EVER again.
I have these installed on my PSD after I had leaks from the old donuts. DO NOT replace the donuts and use the old pipes they get warped after all the exposure to the high temps.
Blows my mind why they put them in the medium duty trucks from the factory, but ford didnt want them on their trucks, its all a reliability issue. With the Donuts its innevitable that you will have to replace them, with these you never have to touch them again.
It also makes turbo removal/install ALOT easier.
If you install a turbo once on these engines its a PITA to get the collector to mate up to the turbo, with the bellowed pipes you have room for the pipes to flex where you want without completely unbolting the up-pipes from the collector/manifold.
Ford 7.3L Powerstroke Bellowed Turbo Up-Pipes Bellow
Here's the link to the site that you can order them from, or just go to your local international dealer.