Slanted Humbucker Base Plate - as found on the Gibson® and Epiphone® Nighthawk
Beyond the strange shape - everything that fits to them is standard - its just offset in the guitars body, and as such, required a specialist base plate if you're replacing, or building your own versions.

Available in 50mm and 52mm.

This is a pickup base with 3 mounting lugs - different from the "Fender®" Version, but used on the Gibson® Sonex in the late 70s/80s and still in use on the Yamaha SA (and the old SG) Series.

Available in 52mm.

These base plates are SPECIFICALLY for the "H Gate Style 2" covers

Much more rounded in the corners to accommodate the larger radius on those covers.

Humbucker Base Plate.
Available in 49.2mm, 50mm, 52mm and 52.5mm.

Available in 49.2mm

Vintage spec humbucker bases, avialable in Nickel or Brass.

Complete with squared off, long legs, 5-40UNC threaded pole holes, and rounded wire hole - ideal for historic builds and repairs.

Dog Ear P90 Base for a staple poled P90