I have a power steering cooler in the return line of the Charger. It is steel and came from a mid 80s M body Police car. It has served me well but I thought I should find a spare in case this one ever cracks and can't be fixed. These M body cars are not so common anymore so I started looking at late model cars. Many have some type of inline cooler but I recall hearing that they can be found on Dodge/Plymouth Neon and PT Cruiser models.
I did find that to be the case. They are mounted to a front crossmember forward of the steering rack.