With regards to bridges what Ive been doing pretty much since I started with Jimmy's basses is pick a bridge based on comparisons going back and forth on any individual bass I own/owned. I made sure I owned an example of whichever bridge jimmy was offering or had offered. I used my ears, sometimes it corresponded to what Jimmy thought, sometimes it didn't. Although basses of the same model spec sound generally or mostly the same in some fundamental categories there are still some differences between them to my ears. Weight, finish, era of pups, and just how different pieces of the same wood species come together all contribute to each bass having its own slight or not so slight tonal personality differences imo. Although I've found I generally like brass bridges on RAs, but not on all LMs, L shaped threaded steel on LGs more than bent plate single thread saddles....etc...my advice to anyone getting into the brand or even people who have one is to experiment and use your own ears for your own taste. Jimmy had to standardize his bridges which makes sense, and going for the vintage steel Ls was the way to go generally, so thats always my basis for comparison.
