Came up with all sorts of items like you request using the term "Brake studs"
Here is one:
http://www.tradekey.com/ks-bicycle-brake-studs/
Cantilever Studs works too.
http://www.jensonusa.com/store/product/BR309Z00-Replacement+Cantilever+Stud.aspx?SSAID=189062
Cantilever Studs - Google Search
@AuDoc started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Came up with all sorts of items like you request using the term "Brake studs"
Here is one:
http://www.tradekey.com/ks-bicycle-brake-studs/
Cantilever Studs works too.
http://www.jensonusa.com/store/product/BR309Z00-Replacement+Cantilever+Stud.aspx?SSAID=189062
Cantilever Studs - Google Search