Fits great for Yukon 2003 XL SLT window. Took about 40 minutes to put in. The hardest part of taking off the door panel is disconnecting the window switches. I looked at many installation videos. On some models the window switches will just pry out of the door, but on my model Yukon, the switches are screwed into the door panel, so you have to disconnect the wiring harnesses after you loosen the door panel. Don't attempt to remove the window switches from the front. Not extremely hard, but takes a little bit of maneuvering between the door panel and the door to get under and disconnect the wiring. After the panel is off, it's easy enough to install this. I did the driver's front side (741-644), and about a year later the passenger front side (741-645) also. I'm not sure if this is the fastest or smoothest regulator out there, but both windows working great for me. Happy with Dorman so far.