Umm... metal hooks like that are available at any hardware store. They're called S-hooks and should be near the chains. Simply insert one section of the S through the elastic loop, then use a pair of pliers to squeeze it closed so it can't fall off.
(I replaced both hooks on my grocery panniers this way!)
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"There is no greater wonder than the way the face and character of a woman fit so perfectly in a man's mind, and stay there, and he could never tell you why. It just seems it was the thing he most wanted." Robert Louis Stevenson
