I haven't seen a three core one before.

The two core ones are getting harder to find. Try these numbers

https://infopart.org/mercedes-benz-1155011701-part

Part MERCEDES 1145011101, Radiator, engine cooling analog, prices and availability - FindPart.org

Use this information with caution! Make sure this is what you expect it to be from the seller (not me) before you buy.

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!