On my 41 I used a Telflex cable or push pull cable if you will. I put a YJ wiper motor under the Dash and ran the cable up the A piller To the original wiper hardware that I had tied together with a small iron strap.
The Cable is secured to a plate that holds it so the back and forth action moves the wipers. The other end of the cable is secured to a plate that mounts the YJ motor. I used the YJ arm to provide the motion on that end. Best part is it didnt cost me any out of pocket money.Also hooked up the wiper delay switch using the original YJ stalk mounted hardware.