Music Man Bass StingRay Pickup,4 Strings,Alnico 5 Piece Rod,Dual Coils
They can been used on Neck or Bridge position.
Both models are same string space:57mm
Conducts:2 wires
Resistance for both models are same:8.7K
White wire is hot wire,Black wire is ground wire.
#401 is for Music Man Bass RAY34,
#402 is for Music Man Bass RAY4,Ray24,and most Asian made Music Man Bass
Please choose the model on the above option.