bcbender,
First thing is to find a new dealer as mentioned above. I have access to a limited Mopar/Dodge on-line catalog from a vendor and found that clamp in the Dodge system using my '06 VIN in about 5 minutes not really knowing what I was doing sitting in my den. Unreal... ... .....

Item 15 mentioned above would be turbo to elbow connection clamp. That would be 3535399 which supercedes to 4089833.
But I think what you are asking for is the elbow to exhaust pipe clamp. That is different and not pictured in the turbo breakdown shown in the link.
Dodge number for that clamp is 52121285AA. Looked it up and also went out to the garage where I had a spare from putting my Jale Brake on and that is shown on that clamp so I trust the number.
Checked Cummins Quickserve, no dice with vin or without. Scratched head for a minute, then remembered that 2 spares came with Jake Kit, one for the turbo and one for the pipe. Dug out parts list and that shows a Cummins Number of 4920021 for the elbow to pipe connection. Checked my price tape and it is still a good number and would sell for about $30. 00.
So that should get you going, if you have any more questions let me know. Check your Dodge Dealer if you want, they look to be in the $30. 00 to $40. 00 range but depends on your dealer... ...
To Recap, Header pipe to turbo outlet clamp is... .
Cummins # 4920021
Dodge # 52121285AA
Mike.
