The wipers can be made to swing anywhere from 90 degrees to 150 degrees. These three photos show my trial and error method of determining the maximum swing of the blades without hitting the windshield rubber. I made an adjustable protractor-like device out of cardboard and tried a few different sweep angles. Final sweep was determined to be 120 degrees.
Regardless of which sweep angle I used, the wiper arms and blades would need to be cut down as they were too long to be used on the Willys windshield. SPW gave instructions on how to shorten the arms. Each arm was shortened by 1/2", and each blade end was also shortened by 1/2" to get the blades to keep from hitting the windshield rubber.