I have limited knowledge of old vintage brass bridges, but one i know for sure, was the '80s Aria SB basses. But they used very narrow string gauge, something 16.5 mm
That could well be too narrow for you and too narrow for a P bass ( if that's what you play ) and the strings probably wont line up over the P pickup poles
Having said that, they're as rare as chicken molars to find. Most people dont strip then off their vintage Aria SB axes