I believe that the theory of wire coil inserts being nessecary on the lower hose in order to prevent them being sucked flat is a bit of an "urban legend".
A properly functioning cooling system on a modern vehicle should maintain a system pressure of approximately 15 PSI ... more than enough to prevent collapse.
It's also why most replacement (molded) hoses don't have a coiled insert in them.
Radiator Hose Coils
That being said, and as already pointed out, you could always rob the coils from another hose and use them with yours.
Those "universal fit" flexible hoses
incorporate an integral wire in their design in order to prevent them from kinking at the curves.