sorry to dumb everyone down, but will Bartolinis fit directly into mexican j-basses? The reason I'm asking is that I was reading up on Aero pickups and they make one specifically for the Mex J because the bridge and neck are the exact same? I'm getting confused. It's basically my first 'update' to a 'cheap' bass after years of just playing mex p&j's until they fall apart and just buying another. Thanks.