Finally. Seymour Duncan now offers more pickups in its rail design. Simply put, these are existing models given the pole pieces-less rendering as seen above. The JB & Jazz models are offered individually or as a set (Hot Rodded).
Also available - Nazgul & Sentient (as a set as well).
Prior to this, SD rail models are limited & somewhat costly, the most affordable being the Dimebucker. The Slug, Jupiter & Diablo are custom-based models which retail for more. I bet there would be some peculiar characters who would claim they hear a different tone coming out of these ones due to the absence of pole pieces.
Pics: Seymour Duncan
