2002 Nissan Frontier XE 2wd 2.4l KA24DE Automatic Trans. I have a few questions. I cant put it back on because the holes for the bolts are rusted and cracked. 1.) I cant seem to find a place online to find one. Anyone now where I can get one and how much does one cost? 2.) Do I need one on it or can I just take it off? 3.) Do you guys think I should also replace the O2 Sensor because of the shroud leaning on it?