Thunder I-A bass bridge

I picked up a Thunder I-A bass for next to nothing. It plays well but the bridge is very corroded. Assuming I can get it off where do I get a replacement?

Check out this thread, it shows you how to clean a corroded brass bridge.

Thread link.

http://www.warmoth.com/hardware/bridges/bridges.cfm?fuseaction=bridges_schaller_475

have a look at the Schaller bridges. belive it or not, they have the exact string spacing and fixing holes too
not only that, they look great. i think they are available in England too

other than that, it'll be a strip down, a polish and a gentle coating of laquer.