Humbucker baseplates for the building or repair of humbuckers.
These come in a choice of either brass or nickel silver. Brass causes a subtlety higher amount of treble attenuation.
There is also the choice of either 50mm or 52mm pole spacing. You'll need to measure the outermost pickup pole pieces from the centres and find the distance, so that the screws can extend out of the bottom of the baseplate through the holes.