Hayes Internal Master Cylinder Parts.
All HFX-MAG compatible master cylinder internals are designed for the current aluminum piston/2mm push-rod platform (2003 and newer)
Plastic piston/2.5mm push-rod parts are no longer available -- BR4336 may be purchased to update 2000-2002 MAG brakes
All parts listed as El Camino compatible will also function with E.C. Trail brakes