$85 is pretty cheep since that unit list for $135 and they are model specific 2 or 4 door lx & ex if the unit is a diffrent color be carefull the S82 = 2 door and S84 = 4 door. to install unbolt the 10mm bolts holding the fusebox and push on the retaning clips should losen the fusebox up ( disconnect the battery first & have radio code handy) unplug the green plug on the multiplexer then for the fun part! use a 90 degree pick tool and pry the clips holding the unit in with a twisting motion after that the new one just pops in or unplug the fusebox far enough and use a screwdriver to get it out.