The problem with those coolers fittings is that they are aluminum and the hose fitting is steel. We have cut the threaded section from one and TIG welded it to another for a good repair. The only way to do this though is to have a bad cooler with at least one good set of threads.
I would be glad to do it for you, but coming up with the threads is the problem. I'll check and see if we have any damaged coolers in our metal pile if your interested.
Bosch Master, ASE Master, L1
33 years MB technician