Fabric shops such as Hancock's have this material. When I had my GN years ago, they had a perfect grey match color. The 3M spray on adhesive is the way to go here to if you do it yourself but you have to be sure and clean off all the old glue residue and headliner material. Good reference on this job over at GNTTYPE.org Very inexpensive. If you farm this out, the labor is what kills you and jacks up the price.