Here is a pair of Warwick MEC Dynamic Correction jazz pickups and control circuit.
Pickups - 5 string, passive, single coil, silver label, potted, very well made, sound just like single coil j pickups should.
Controls - Vol/Blend/Tone circuit, passive.
These were removed from a German Corvette 5 string bass.
Let's say $70 shipped
for the whole package.