The new guide is drilled for a rivet to secure it to the door. The old guide has a T25. I don't like rivets, so I reuse the T25.

After the window is raised to the top and the door panel is removed (don't forget the black plastic phillips screw in the bottom right corner), take out the failed guide. It should have fallen down.

Remove the T25 that holds the guide to the door, but save the piece of metal that the T25 screws into. You may need to hold on to it while the screw is being removed.

Install the new guide. Use a wire or punch to line up the hole in the door and the guide. Carefully put the saved piece of metal over the punch or wire and hold the metal in place as you remove the punch or wire. Thread the T25 through the hole and slowly turn it to catch the piece of metal. The metal will not turn on the new guide and you can torque it down nice and snug.

Plug in the door panel and test your work!

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Keeping it running is better than buying new