brush/grill guard

What determine whether or not you can install a certain guard to the car? A buddy of mine has a guard that came off his 96 Pathfinder I am interested in, but I want to know if there is any chance it will fit on my 95 Rodeo.

Very unlikely it will fit without some custom fabrication. They have brackets that bolt to the frame and obviously a Pathfinder frame is different than a Rodeo frame.