I had to remove the existing plastic fuel cell, and had an aluminum one fabbed to fit the same hole. Before I could have the flanges welded on, it all had to be test fitted to get it right. I had to remove the hold down for the factory jack, as well as the raised section for the gas neck filler tube, then, I determined the leafs were a little too close to leave it square on the bottom, and it had to be sectioned again...Then it was alll fitted up and I redid the entire trunck area.