Since I was placing a McMaster-Carr order I decided to get some Oetiker "ear" hose clamps.
McMaster sells Oetiker pliers too. I don't know if Oetiker hose clamps were originally used by VW or not, but my former low-mileage '65 Squareback had one section of very old fuel line when I bought it that was secured with them, and they looked old enough to be original equipment. I've always liked them.
To install them you crimp the ear, and to remove them you clip the ear off. One use only.
A much more professional solution than those hardware store screw clamps you see on most engines. I never did like the idea of using garden hose technology on a car.