Thanks again, Donnie.
I should have known this, having taken the radiator out a few years ago to have it rodded out, but memory fades.
These metal topped radiators are the Bees' Knees - Merecedes should be roundly criticized for going to the plastic topped ones.
It's easy to miss, as so little of the bracket shows atop the rubber bumpers either side, but I managed to get the thing installed, albeit not without some choice Garage Language!
Your expertise is, as so often, the Final Word.