I have a pair of those, they are military surplus skins, sometimes you see them inexpensively on ebay. The actual skin material is high quality. I have used them briefly and they do work, but have never done anything hairy like an icy traverse. You need to rig up a tail strap arrangement to tension them - originally they would have a small loop screwed to the ski top at the rear, to pass the tail strap through.
I don't know if the backing material will accept skin glue, it is probably not that different from whatever material is used in current glued skins, but I have not tried. You can bend those clips to fit on different skis, or you could take them off and rivet velcro straps on. There used to be skins w/o glue and with tip and tail hooks and intermediate velcro straps.