Putting a single coil in a humbucker slot

What's the difference between single coil pickups and humbuckers? is a question we get

Here's the quickest, easiest way to swap in a humbucker in place of a single coil pickup

single slot bracket These are the Porter S90 pickups, reminiscent of P90 pickups in a single coil form

single slot substitution drill I was thinking about putting in a humbucker sized single, but people tell me that they don't really sound exactly like singles, and a coil tap