Highway One Jazz Bass - Bakelite Musicmaster Bass These knobs are designed to

These knobs are designed to fit a 1/4" (6

particularly on steel-string acoustic guitars

5mm outer size

This was the only way that they could capture the original sound and ensure we would not disappoint the loyal fans of these pickups

Most importantly

Highway One Jazz Bass - Bakelite Musicmaster Bass These knobs are designed toThis Highway One replacement pickguard will only fit genuine Fender Highway One Jazz Bass. It is basically a JB 300 series pickguard without the thumbrest and pickup cover mount holes. Made from genuine paper phenolic bakelite measuring 2mm thick and does not have any outer bevel around the edge of the pickguard.