This adapter is complete with backing plate. This allows for sandwiching of the auxiliary generator mounting bracket between the adapter and backing plate for pick up attachment. The adapter comes with three grade 8 mounting bolts. Once attached to the auxiliary generator mounting bracket, the adapter is easily connected to the "C" Frame Manipulator. This appliance is for all modern GP's and SD's (not including 7's and 9's) except for the GP-38 which is serviced with the T57371.