For your 2016 Mercedes CLA250 the Curt hitch part # C12163 is a fit and a great choice for carrying a bike rack or pop up camper. For trailer wiring you'd then want the # 119250KIT for a zero splice kit and then for a ball mount/draw bar (they are the same thing), you'd want the part # C45521 with hitch balls # 19258 for a 2 inch ball or # 19256 for 1-7/8 inch ball. view full answer...