Fits 2015-2017 Freightliner XC Lowered Rail. 2015 Freightliner XC Lowered Rail Engine: 8.9L L6; Position: Water Pump, Alternator and Air Conditioning;. 2016 Freightliner XC Lowered Rail Engine: 8.9L L6; Position: Water Pump, Alternator and Air Conditioning;.