Our 1985 CVH engined 4/4 had lengths of copper pipe in the cooling system and was original when we got it in 2003. I would say that your copper pipes are original but I did not change the hoses that you are having issues with - only the larger top and bottom hoses.
The olives idea above sounds like a plan. You could try using two jubilee clips but the olives will provide a more secure solution.
