Relic jack plates for Les Paul type guitars. Ageing effect tastefully added at the factory.
These are USA size and will not fit Epiphones and similar import models.
To install, simply unscrew your old one, unsolder the wires, remove the jack, install the jack in the new one, solder the wires onto the new one and screw back on.
Mounting screws can be found here
Mounting hole spacing: 26mm
Jack hole diameter: 10mm