I have a set one bass pickup, one trebel pickup. The treble pickup comes with the mount. These retro fit on any 4001/4003 bass. No routing or whatever necessary. They are currently out on a certain site but i can do whatever I need to do if someone here is interested. The bart site shows these as 126.00 each. Feel free to make an offer. I need a set of Ric bass pickups so if someone is experimenting, we can trade. Email if you want pix.