you mean one of these?
It's a NOS Huret, fits Shimano cable stops and DT shifters as it has the square fitting, however the bolt threading is not the same an M% bolt does not fit. For the one I fitted upgrading a friends old bike I just routed through my nut & bolt tub until I found something that fitted, still had to chop one of them down and niether bolts/screws were from a bike part so more luck than anything else.
If you want one it'll be £6 including postage within UK
1958 Carlton Super Python
1990's Gitane VITUS GTI Triple Butted
1996 Raleigh Titanium Special Products Division
2007 Specialized Globe Pro
2007 Specialized Globe Expert Ultegra 6700
KTM Strada 6000 Carbon Dura Ace 9000