$72 on string lock bolts!? Wammi World has the 1 5/8" and 1 11/16" complete nuts for $59 each. Clamp screws for the pads are $1 a pop, pads/plates are $5 a pop. In total, $18+shipping. Links!
clickity click click
You point and click the part number you need. There's 2 types of clamp screws you can choose from.