I also mentioned this way back towards the beginning of the thread.

Most of the add on Engine Oil and Transmission Coolers I have seen all used Hose with the normal type Worm Gear Clamps. But, the Barbs on the Coolers are made to fit the type of Hose that is to be used.

On the 84 300DW123 Oil Cooler Hoses the Hose Barbs are somewhere between 1/2" and 5/8" so American inch size Hoses are not a good fit.
That means that holding the Hose onto the Barb is more dependent on the Clamps then on the Add On type Oil Coolers.

__________________
84 300D, 82 Volvo 244Gl Diesel