i wonder the same thing.. the place that replaced my regulator and motor scratched up the paint on my frame.. it doesnt work well so i dont think they knew how to do it.. the grease, where do u apply it with a brush? for my car the dealer wouldnt sell just the regulator u have to get the motor too. very pricey..no run channel replacement though..i think there are adjustment screws in the door that adjust the window glass back and forth to make it run up and down smoothly and eliminate wind noise..