oil coolers

Did they just use one type/setup oil cooler on the dippy type cars and if so does anyone have the part number?

Thanks.

Unsure about one or multiple setups but, the p/n for one of them is 3868974. That's from the '79 parts catalog. It show only for "H,N" models with E58 360 though. The Police/Taxi section of my catalog is empty which is where the "G" Dippy squad would be shown probably.