Here is a gently used Audere JZ3 Pro Jazz Bass preamp. Also includes the little switch doohickey thing.
This one is set up Volume/Balance, Lo Mid/Hi Mid, Treble/Bass, and also has the Z-Mode switch. Really versatile preamp.
I no longer have the installation instructions but it's very easy, and you can find them online. I also don't have the little metal crimp and shrink tube (since I installed) but that is easy enough to overcome - just solder the bridge and cavity grounds to the white wire and electrical tape them together and you're good as gold.
Looking for $120 shipped/pp'd in the CONUS. Questions? Ask! It's faster to get me by email - cboehmig at gmail.