Help please with these Bart J-Bass Pups. I cannot find anything about them. I recently purchased the pups on Reverb. The etched model is difficult for me to read. I’m guessing they are either ‘9P’ or ‘9D’. Although it could be ‘9O’. They are labeled ‘L’ & ‘S’ even though they appear to be the same size. I’m guessing they are dual coil, humbucking and are wired in series. Thanks.