The ' wide frame mount ' included with the kit bolts through frame. I fastened rear mount loosely, positioned front mount, marked hole. Drilled 1/8 hole, used sheetmetal screw to center / align mount, than brazed mount to downtube. I was later chagrinned to find couldn't get bolts up into mount. Wound up dimpling tubing to clear. 4" long, all thread, M6 bolts got it done for me. I used the bottom saddle bracket for safety,
Allen Heads under the ' bikini ' mount would have looked slicker, but I wanted the added safety of the saddle's clamping force. The 1/2 hole in front mount got a rubber chair tip as a vibration dampener. The dimpling looked hellish, and was filled with PC - 7 epoxy
prior to prime / paint .