We have developed this 4 piece front cab carpet if you want to replace an existing mat. The main front carpet comes with a ready to fit underfelt which can be trimmed back just inside the carpet. We also supply 8 carpet fixing clips to hold the carpet in place. The walk thru carpet has a felt backing. The remaining two pieces fit over the front wheel arches and have a special rubber extrusion sewn in place which will clip into the lip on the outer side of the arch. These pieces need adhering in place. See our part number CK999 for a tin of Evostik adhesive. THIS SET IS FOR WATER COOLED VANS ONLY.