I don't know if they're compatible (whether or not you would have to drill new holes), but I use a schaller roller bridge on one of my basses.
http://www.stewmac.com/shop/Bridges,...s_Bridges.html
The strings sit on little rollers that allow you to change string spacing very easily- so you could try out different spacings to find the best compromise. I don't know about your particular bass, but generally basses with polepieces are less forgiving as far as different string spacings- meaning that you will have little leeway before you will lose volume balance between the strings (some strings will be directly over polepieces, some will only be a little above. In this case, you might want to think about some new pickups that have blades rather than polepieces, like Bartolinis or comparable. I assume you probably don't want to change the sound of your bass drastically, so my assumption is that you will only be able to change your spacing very minimally.....
I just figured I would give my $.02, as I change my pickups + string spacings constantly on one of my basses and found the Schaller to be a fantastic bridge that requires no permanent modification (like putting the saddle grooves in a Badass bridge), so you can experiment infinitely until you've found your perfect spacing.
Karl Zickrick