I believe Rhoads Music has a correct bridge for a 4005 in stock for $300.00. Together with another Toaster and re-wiring to 370 guitar specs, this bass would be very cool while appearing like a factory peice.
I can vouch for Sérgios pickups as can many others around here, I put one of his adjustable toasters on a, gasp! Hohner fretless just to check it out and it sounds great. It was a 2 minute job that's why I did it, I'll install it on a proper bass as soon as I have the time.
If it's any consolation it blows away the stock Hohner PU and it is a 60's bass, and it's a semi-hollow body like a 4005, kinda stretching it a bit now huh?