Where is the oil cooler located on a stock 914/6?

On the engine.. No other oil cooler was installed on stock production 6's

Thanks for the info.

Where exactly on the engine does it mount?

The console on the oil tank. The 6 is a dry sump engine

The Factory oil COOLER on a 914-6 is mounted to the engine on the drivers
side rear of the engine.Toward the back of the car.
Here is a picture of a 914-6 oil cooler on an early 911 engine.. Same mounting spot on both engines.

see red arrow.

Click to view attachment

For a 2.5 Twin-Plug, you may want to run a Front Cooler like a GT. I don't know if Eric (PMB) ever did the Copper Oil Lines that run down the Drivers Side

Thanks for all the advice. I am weighing my options. My engine is in the final stages of installation following a complete rebuild.

Sorry, I read oil filter, not oil cooler. RIF

Which I'm sure was not cheap, which is even more the Reason for a Front Cooler