Those particular clamps; come with the new hoses from the Dodge dealer.
They are what I refer to as the "bitch clamps"; because they are different than regular spring clamps; where as they have a hole and pin drilled into them to lock them open once squeezed; this was for assembly purposes at the factory. All they had to do was take their special tool and pop the clamps closed after putting them on the heater core pipes.
They are in a very difficult spot and if you can re-latch them open, its hard to snap them closed again once they are on without the "tool".
However, once you get those off, a regular standard spring clamp will work perfectly.
It is hard to get those clamps separately, unless you can pick them from an assortment; because they were included with the heater hose assembly, and come with that when you buy new at the dealer....so they dont show part numbers for them in the parts catalog.
To get them, either junkyard as mentioned; or if NAPA has an assortment; or....the closest one I see that may work is Dodge part number 06502018; this is used on the other ends of one of the heater pipes that doesnt come as an assembly, and IIRC is the correct size; I always hoarded these clamps and had a box full of them to go thru when needed lol....