you need bumper, wings, sideskirts and arch liners for a flush fitment. they all fit together. if you wanted the proper full kit then you will need to buy sideskirt clips to fit the sideskirts. the clips are bolted onto the sills and the skirts just attach to the clips. then you bolt the bottom part of the sideskirt onto the sill.
however if you wanted to fit replica skirts with standrd wings then you would just need to tigerseal them on. you would also need to cut a bit of the bumper bracket so that it fits onto teh standrd wings.
iv done both ways and its best to do it properly with the sports wings