Boston machine heads for guitar 73-CLR Tuning Machines
Stagg SP-MHWS-CH Die Cast Machine Heads, 2x3 for Acoustic - Chrome | Rich Tone Music
Amazon.com: Wilkinson 4Pcs Bass Machine Heads (4 for Right) WJB-750 Set – Diecast Treble Tuning Key Pegs Tuners Replacement for Electric Jazz Bass or Precision Instruments (Chrome): Musical Instruments