In addition these are half the height of the stock caps (see photo in the image gallery below)

natural frequency

For FXST/ FLST models

12mm chrome plated domed hex head bolt fits front master cylinder on 2004-up Sportster

Wagner Lockheed Type Rear Drum Brake Master Cylinder - Chrome - 1958-1972 Harley-Davidson FL 1971-1972 FX Length_1.5 In addition these are halfThis complete replacement 3 4" bore rear master cylinder assembly fits drum brake applications on 1958 1972 Harley Davidson FL and 1971 1972 FX models. This master cylinders is available in a beautiful show chrome finish. See Additional Information below for fitment. Replaces OEM# 41761 58 Show chrome finish