Yo, supplementing my inscrutable post about things which hold threadless brake shoes with post about brakes your frame came with; eBaY item 270945089681 (you can search clb or "clb -tones" in the cycling category and find ridiculously priced units as well as ~$40 calipers postpaid.) The shoes look like forged dural and clb is a serious firm, and I was tempted by their stuff when it used to be available from my framebuilding supplier. French engineering is always intriguing.