Custom Styling. Give your mustangs interior a custom appearance with Chrome Door Sill Inserts. These bright Chrome Door Sill Inserts match the chrome accents of your pony's interior perfectly. Easy Install. Installation is easy, simply clean the surface with the included swab and solution, peel the paper backing from the chrome trim, and insert into the recesses of the doors scuff plate. Go from stock to custom in under 15 minutes.Application. This pair of Chrome Door Sill Trim inserts are design to fit 2005 to 2009 Mustangs. The trim inserts will not fit on Mustangs equipped with a metal door sill plate.