The base feet for mounting to the existing rail feet, copied from kiwiblazer. 3/16" sheet metal cut to shape of opening in existing rail feet and extended on the inside to accomodate the mount and support tube behind it. Plate must be bent slightly as the existing rail feet are not perfectly flat where the mounting bolts go in. You could use the existing torx bolts, but I opted to get a slightly longer allen-head style to accomodate the thickness of the plate and adding in a lock washer.