I've picked up a 4-string project bass that needs a little work. The existing bridge appears to be mounted a bit off to one side, causing the strings to be off to one side on the fretboard. Repositioning the neck doesn't fix the problem, so I need a bridge that allows me to move the strings to the side on the barrels without having them slide back to their original position. I'm looking for replacement bridges that have the following features: 1. Fits under a P-Bass ashtray (bridge cover) 2. Has threaded barrel allowing the string to be moved to the side 3. Has slotted baseplate allowing the barrel not to be pulled back 4. Fits the original fender 5-hole screw mount Unfortunately, there don't seem to be any bridges that have these type of adjustments that will fit into the original mounting holes. So it looks like I have to cross-off criterion #4. I'd be willing to settle for a bridge that matches 1, 2 and 3. It seems that all of the aftermarket bridges with slotted baseplates aren't designed to provide lateral adjustment of string position to make up for a malpositioned bridge. So far it seems the the best two options for slotted bridges with threaded barrels that allow you to correct the string position come from Fender: # 1: American Standard Bridge Assembly (2007-Present) #2: American Deluxe 4-String Bass Bridge Assemblies ('04-'10) So here are my questions: 1. Do these bridges fit under an ashtray? 2. Are there other bridges that I should be looking at? Thanks.