GMPartsGiant.com offers the wholesale prices for genuine 2016 GMC Terrain parts. Parts like Roof Headliner are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.4L, 6 Cyl 3.6L. Model Code: SLE1 SUV, SLE2 SUV, SLT SUV.