That short thick hose is a PITA to replace, it is only a few bucks and was found on many MB's. It can be removed with a razor blade and you can try to squeeze the new one on.... Here is a hint, order the gasket for the thermostat housing, mates with the top of the hose, the gasket is where it meets the engine block.
Remove the thermo. housing assy from the block,(two nuts) then clean up the the scale and corrosion on the shaft that is covered by the hose. This is what caused the hose junction to leak in the first place. I use razor blades and crocus cloth. Clean both ends as best you can. I coat the mating surfaces with blue RTV to ensure a seal.
While you are at it, change the theromstat and order a gasket for the theromstat.....