The Ruckstell P145 Gear locking thrust plate has one side that is machined complexly sooth on one side and the other side is machined smooth only around the edges and bolt holes. The rest of the plate is recessed.
Which side faces toward the sun gear or center of the car and which side faces out towards the wheel?
The smooth face goes against the bronze plate.
Correct as Stephen said.
Thanks Stephen and Mark!