CHLOE Heels Dark Mustard Yellow Color Size 38

CHLOE heels in a Dark Mustard Color. Yellowish Tan. Y2K. They are in great condition, besides the wear on the bottom. The little flap on the inside of the shoe is loose and needs to be glued down, I'm just not sure what kind of glue to use and don't want to ruin them. Size 38. 3 inch heel.