Everything from a Scout II power steering that is mounted to the engine will be needed. That would be a saginaw 125 series "teardrop" pump
the oem ps pump and bracket setup from a fullsize pickall won't fit under the hood on a Scout 800 or Scout II. Those pumps are also a saginaw-sourced item, but are the somewhat more hd version known as the "235" series. The pump would fit if you fabricate a mount that drops it lower in the engine bay and tighter to the block.
The '74/'75 pickalls also used the smaller saginaw 125 ps pump bracket.