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@EdwardZ
The Kimoris are available but they are only suitable on the front for NJS (steel round) fork blades and the rear for old school (again NJS) small diamter steel. The Dia-Compes are widely available for both front and rear. There are 3 different front clamps available: round, oval and aero for, resp., Steel NJS, old style road and aero (including some carbon) forks. The aero version does, however, not support flat aero forks--- its around 30mm long.
The Dia-Compe rear fits pretty much anything that has uses seat-strays--- no mono-stays--- and has enough room (the vast majority of frames). Its just two metal plates with a hole. The Keirin riders all use these since they are simple, cheap, fast to mount and work well. They are also well suited to DIY efforts with some alu extrusion rests (people have even made them out of old alu rims).
With a fixed gear the rear brake has much more of a function than with a freewheel bicycle. The rear brake can help control.