Yes, we had some extras left over from a server room buildout and it turns out they were useful after all. They are really tight and I used the cushion from the bottom of the silver package, cut it in half and placed it under the straps on the ends to add some cushion. They hold the cells together quite well. I was tempted to add the aluminum to the sides to help dissipate heat and add rigidity, and may still.

I've also added straps across the top of the panniers to provide a temporary solution should the clips break or something.