Cream plastic humbucker mounting rings
In this listing you can buy the SET (Bridge & Neck rings) or SINGLE (Choice or Bridge OR Neck ring)
These are flat base type with slanted sides.
Measurements
External measurements (both Bridge and Neck rings)
92.5mm x 45.5mm
Distance between screwhole centres
82mm x 37.5mm
Bridge ring tapers from 7mm on thicker edge to 5.3mm
Neck ring tapers from 5mm on thicker edge to 4mm