You could also take apart the existing WRHB and whatever new HB you wanted to replace it with. Use the WRHB baseplate/cover and the new HB bobbins/magnet. Pop the slugs out and replace them with the screws from the WRHB. I just did this in my '72 Deluxe and it worked great. Threw in a SD '59 with no adapater ring, no new pickguard or anything and it keeps a consistent look with much improved sound. Purists may not like the 'Fender' cover over a Duncan, but I'm alright with it.