My electric wiper motor is after market and is mounted on the inside of the windshield.
I am, however, able to crack the window enough to let in a sufficient amount of air, thanks to the installation of a modern spring loaded wiper arm that is flexible enough to allow for this. Actually, my "modern" wiper arm is for a 1959 VW bug and it works
just fine. The wiper motor came from Mike's Affordable in Georgia. Oh, Lordy, I can hear the purists now!
Jack