These are reproduction top motor mounts / head steadies for unit Triumph motorcycles. Brand new with black finish to match your frame. These bolt from your motor to a stock tab on your frame, and help keep vibration down. If your bike has no top motor mount (common on custom choppers and bobbers!) these will help smooth out your ride. 70-4778 is the OEM number, there are 4 of these on each bike, 2 for the front rocker box and two for the rear. These are sold per pair (2 pieces) so if you want to run both front and rear top motor mounts, order two sets!