[Hint: I did my versions with PLA. As the radiator gets hot, my hooks deformed over time. I did a reprint with PETG, which seems to work fine (ABS should do too, i assume)]
I stumbled over this thing: https://www.thingiverse.com/thing1:2504612 which i considered being a very great idea.
But it doesn't fit on my radiator, so i did a new thing with a new design in a new size.
Comes with a Fusion 360 file for modifications or whatever.
Das Filament PETG/ABS (PLA deforms over time)