Guess I need to change the cab vents on 08 Silverado. One side is leaking water into the truck when it rains. I held a water hose on it and you could see the water running in. I've watched several videos on how to change. They range from popping them out, laying on the ground and reaching between the cab and bed of the truck and pushing them back in. Others have removed the back seat for access and another talks about taking off the truck bed for access.
Has anyone ever changed these and if so what's was the best option?

Thanks