I'm posting a couple links to the part numbers for the hose I think that you're talking about. The hose is called "From intermediate piece to heat exchanger".
They are discontinued, but you might find them on ebay or somewhere else online. If you can re-post your picture it would help.
You might also be able to use a generic hose from an auto parts place. You might have to take yours off and bring it to them so that they can match it.
You can also try contacting Rob at @NeedsWings Needswings.com

LINK to Chrysler part 5099546AA

LINK to Mercedes part 170-830-10-96