1/4 glass regulatiors

If my memory serves... It would be impossible to install these regulators on the wrong side. The stop for downward travel is a eccentric block under the regulators ring gear. I remember this.,,, In a no post coupe they are a pain in the butt to get seal aligned correct to the door glass. Then rebuild the door hinges later will change the door glass position and you start over at the quarter glass alignment. Good luck with yours.