I would recommend using either a humbucker or single coil pickup(s) with blade polepieces. This helps when you are using a non standard Gibson or Fender spacing that the majority of pickup replacement companies manufacturer.

If you have a non standard string spacing and need individual poles correctly spaced under each string then a custom pickup should be considered. You have many choices for the type bridge and pickups that can be used for your specific application. I would consult with other pickup companies to get specifications and dimensions for mounting the various types of pickups available.