I recently picked up a custom Explorer-style bass off of Craigslist. It's a beautiful black walnut/maple body and neck, with all the wiring done. Need to toss in a set of j-bass and p-bass pickups and string it up, and it'll be done...BUT... I'm having a helluva time figuring out which bridge it is drilled for. It is a string-thru (4-string), but the five mounting screws are drilled BEHIND the string-thru holes. I thought maybe it was for a Wilkinson, but that doesn't seem to be it. Anybody got any ideas what kind of string-through bridge has the mounting holes behind the string holes?