No instructions needed - pop off door panels, unscrew old mirrors and disconnect wiring harnesses, screw in new mirrors and connect harnesses, put door panels back on, done. If you want to connect the back-up LED spots it'll take a little more time to wire; I didn't. Turn signals were plug and play even though my truck didn't have turn signals on the OEM mirrors.
If you don't take your door panels off as much as I do, watch some door panel removal videos or installation vodeos for other brands of mirrors, it's pretty straightforward.
Only gotcha was the passenger side wire was a little shorter than OEM, had to pop out the switches on the door panel, put the door panel back on first then connect the harness and replace the switch pod. But both mirrors took about an hour with minimal frustration. Good looking mirrors too, nice upgrade from OEM.
Posted by Stuart (Norristown, PA) / August 29, 20212012 Chevy Silverado 1500