If you have a 2013 GMC Terrain and need a windshield replacement we first would like to ask is your vehicle equipped with the optional Forward Collision Alert and Lane Departure Warning System? This dictates which replacement part is needed to complete a full windshield replacement for this vehicle. If you are not sure if you have this feature then fill out the form for a quote request and get your VIN (Vehicle Identification Number) ready because we will need that to determine what features your Terrain has.