The Cadillac GM OEM SRX Front Differential-Pinion Yoke Companion Flange 19179936 NIB is a genuine OEM part that is a direct replacement for the front drive axle of a Cadillac SRX. It is a companion flange that is used to connect the driveshaft to the differential pinion yoke. It comes with a 1-year warranty and is sold as a single unit. The part reference number 20 on the diagram is included.