The part number you bought is for the 3.0D Special editoon kit ,where the bumper flares are the only thing thats different from the 4.6is flares kit.Totally pathetic how 2 similar pieces of plastic have a 160.00 price difference!
Anyway ,you have 2 choices now.Take that back and get the 4.6is part number or safe yourself 140.00 and get another "special edition" flare for the other side.