Welcome to Dr. Björn's Auto!
These Wiper Blades are the ones you've been looking for: they fit the T3 Vanagon just right! German engineered wiper blades are aerodynamic to reduce wind lift, are quiet, and will last, with a strong anti-corrosion finish. Available in the original 18" length, a better 19" length for greater swept area and better vision, and the "Ultimate", which is an even higher quality and low profile 19" wiper. And of course, don't forget to replace the often-neglected 16" rear wiper as well! (16" fits the front window of the T2 Bus as well).
Tip: Check wiper arms and hinges for movement and tension which keeps the pressure on the blades.