Thank you Gentlemen,
Based on your information and feelings, I called Rocky Mountain Cummins and politely requested the exhaust elbow, and the serpentine belt. I was first told that they threw them away, but after further polite but firm discussion, they said they had one that they hadn't given to the owner, at it must be mine. <<grin>> He said I could pick it up. I indicated that if the items had been offered to me at the time of the service, it would have cost no one any additional time or money. I live quite a distance from the cummins center, and asked them to ship them, and after a long silence, I indicate that 3 hours of my time and the fuel represents well over $200 which seems like a bit high of a penalty for something which was in no way my fault. He agreed and is sending the part.
Thank You.
Your comments provided the basis for their return.