New Precision Bearing (Coast 2 Coast) pinion bearing seal.  This is for the differential pinion yoke.  Stock replacement, for 12-bolt car applications.  Fits the following:

68-72 Camaro w/ 12-Bolt
68-72 Firebird/Trans Am w/ 12-Bolt
68-72 GTO w/ 12-Bolt

NOTE : This does not fit any 12-Bolt Truck Rear!!!