Finally removed the last original clamps and hoses - the twisty ones with the strap. I removed several when I got the car years ago as I replaced some hoses. However, thought I should really replace any remaining 53 year old hoses as I do drive the 250 quite a bit and often take long trips.
Sad day, but they had to go to keep the car reliable. I have new 9mm strap and twisty clamps but they are such a pain that I opted to reach into my bag of Norma clamps. Had to cut the hoses to ease removal.