If you broke the back part of the door pull the easiest thing to do might be to repair it. Otherwise you may need to buy a door panel to find the part you need. Assuming your door pull is broken remove the two screws that go into the door panel and door through the door pull. Spin those broken pieces around in the door panel until they come out (this will take a while but it's easier than removing the door panel). Once you got those out epoxy them to the back of the door pull, consider adding a strap to either side to provide strength the whole piece. Reinstall and you should be ok.