I replaced the upper and lower radiator hoses in my 98 Tradewinds with Cat 3126 engine. It is on a Freightliner chassis, so don't know if its the same as yours, but mine had a total of 6 rubber elbows to be replaced. The upper and lower hoses are metal with a rubber elbow at each end, and there is a 3rd hose crossing from left to right under the engine that also has a rubber elbow at each end. Got all 6 radiator elbows from Freightliner. They were no more difficult to remove than car radiator hoses. A little tight getting a wrench on one or two of them. Check your owner's manual on the refill procedure - you don't want to create an air bubble in the heater hose lines when refilling the system.
K&M