I have decided to make a Roscoe Beck 4 vintage looking jazz bass. I can´t get hold of Bill Lawrence (who makes the pup for the RB5). He hasn´t answered my mails and I dont know if he does a RB4 pup. It´s pretty hard to call him from Sweden too. The other alternative is to go with Rio Grandes powerbucker splittable humbucker pups. What would you do? I want a splittable humbucker that sounds like a vintage jazz in singlecoil mode.