as far as I can see there is no separate oil cooler, there is a 3" (outer diameter) coming down from the water pump to a metal pipe that runs under the radiator and connects to rad at the right left hand side.
The oil pipes are connected to this metal pipe, one at each end so its very likely that @lexion780tt is correct
when he says heat exchanger.
The attache pic is taken looking up under the water pump and u can see the 3 inch pipe (now painted yellow).
If you look carefully u can just about see where one of the oil pipe connects to the metal pipe under the rad.
The oil pipes are connected to this metal pipe, one at each end so its very likely that @lexion780tt is correct
when he says heat exchanger.
The attache pic is taken looking up under the water pump and u can see the 3 inch pipe (now painted yellow).
If you look carefully u can just about see where one of the oil pipe connects to the metal pipe under the rad.