all non USA and import basses that did NOT come with EMGs are Jackson pickups made in USA, with a J-2000 2band preamp. The tuners and old style bridge are rebranded gotoh's
there is nothing on any USA or Jap import that was "made exclusively" for Jackson, the company just bought everything from someone else and put their name on the things.
neck radius 12-16 and everything else on any USA from back in the day with p/j and preamp is just the Jackson version of the neckthru Charvel 3b, which I have had many of.
no fin neck on the Charvls, and the Charvel headstock was longer, but everything else is identical:
I only have 1 anymore for collectible purposes as I have never ever in 25 years seen another rainbow crackle bass. Crackle in different colors yes, rainbow, no: