Just in case anyone is contemplating changing the pickups in a Jazz Bass, I have just had a pair of NJ4 pups installed (Got them from Best Bass Gear.) in my parts Jazz. Alder body and rosewood board. The tone is killer. Smash reviewed them in his "Summer Showdown" and since he did such a great job of describing their tonal characteristics I'm not going to try to do that here. Suffice it to say that I am more than pleased with their vintage-y tone.