S4 skirts need bonding/super strength velcro door trims just need new clips and theres two parts to them a rear plastic that the coloured items clip on to i put off doing mine for ages but wish id of done them sooner as there actually not that hard to do, i did use self tappers with sealant to just secure the underfold of the skirts to the floor pan pikey but did the trick snd alot cheaper than genuine brackets, ive ripped up the sill trims and going to put S4 items on at some point you can trim them down though but they are tough to cut.