Well your description and the pic don’t agree. Your pic is based upon a slab side 51 Pbass (notice there is no forearm contour)
The builder will allow for a neck pup choice of a Rio Grande Power bucker.
While that’s not the pup in the pic, it is closer.
The question is, what neck pup do you want to use? Hard to tell from the pic, but it appears related to either a Darkstar or a Gibby Mudbucker.