Seymour Duncan BASSLINES SMB-4A for 4-String Music Man Bass 11402-22 

Alnico magnets like those used on the original 1976 StingRay basses, together with unique coil windings, make the SMB-4A both warmer on the bottom and more detailed on top than their ceramic magnet counterparts. Uses .375" diameter Alnico 5 rod pole pieces and a winding spec that's designed to produce the same resonance as the original. Includes mounting hardware and detailed wiring diagram. (Black)