Ok...so i picked up this custom J bass and i LOVE the damn thing to death....but i cant find any info on its guts. Its got two Bartolini pickups (j style of course) which i assume are the older models since this thing was built a few years back. Under the plate there is a seymour duncan preamp...with to my eyes has no model number designation. I looked at their site and wouldnt ya know...they all look very similar. Any one know how i can tell which it is? Im just looking for specs and info... thanks in advance.